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Pre-battle plans

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Belgium's strained alliances

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The Belgian place in Allied strategy

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Belgian military strategy

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Belgian plans for defensive operations

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Eben-Emael: the Belgians hoped to severely delay the Germans using such fortifications

The Belgian plan, in the event of German aggression [italics in original] provided for:

(a) A delaying position along the Albert Canal from Antwerp to Liege and the Meuse from Liege to Namur, which was to be held long enough to allow French and British troops to occupy the line Antwerp–Namur–Givet. It was anticipated that the forces of the guarantor Powers would be in action on the third day of an invasion.

(b) Withdrawal to the Antwerp–Namur position.

(c) The Belgian Army was to hold the sector–excluding Leuven, but including Antwerp–as part of the main Allied defensive position.[1]

In an agreement with the British and French Armies, the French 7th Army under the command of Henri Giraud was to advance into Belgium, past the Scheldt Estuary in Zeeland if possible, to Breda, in the Netherlands. The British Army's British Expeditionary Force or B.E.F, commanded by General Lord Gort, was to occupy the central position in the Brussels–Ghent gap supporting the Belgian Army holding the main defensive positions some 20千米(12英里) east of Brussels. The main defensive position ringing Antwerp would be protected by the Belgians, barely 10千米(6.2英里) from the city. The French 7th Army was to reach the Zeeland or Breda, just inside the Dutch border. The French would then be in a position to protect the left flank of the Belgian Army forces protecting Antwerp and threaten the German northern flank.[1]

Further east, delaying positions were constructed in the immediate tactical zones along the Albert Canal, which joined with the defences of the Meuse west of Maastricht. The line deviated southward, and continued to Liege. The Maastricht–Liege gap was heavily protected. Fort Eben-Emael guarded the city's northern flank, the tank country lying in the strategic depths of the Belgian forces occupying the city and the axis of advance into the west of the country. Further lines of defence ran south west, covering the Liege–Namur axis. The Belgian Army also had the added benefit of the French 1st Army, advancing toward Gembloux and Hannut, on the southern flank of the B.E.F and covering the Sambre sector. This covered the gap in the Belgian defences between the main Belgian positions on the Dyle line with Naumr to the south. Further south still, the French 9th Army advanced to the Givet–Dinat axis on the Meuse river. The French 2nd Army was responsible for the last 100千米(62英里) of front, covering Sedan, the lower Meuse, the Belgian–Luxembourg border and the northern flank of the Maginot line.[1]

German operational plans

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Map of the area between Belgium and the Netherlands near Fort Eben-Emael: The fort protected the vital strategic bridgeheads into Belgium

The German plan of attack required that Army Group B would advance and draw in the Allied First Army Group into central Belgium, while Army Group A conducted the surprise assault through the Ardennes. Belgium was to act as a secondary front with regard to importance. Army Group B was given only limited numbers of armoured and mobile units while the vast majority of the Army Group comprised infantry divisions.[2] After the English Channel was reached, all Panzer division units and most Motorised infantry were removed from Army Group B and given to Army Group A, to strengthen the German lines of communication and to prevent an Allied breakout.[3] Such a plan would still fail if sufficient ground could not be taken quickly in Belgium to squeeze the allies against two fronts. Preventing this from happening were the defences of Fort Eben-Emael and the Albert Canal. The three bridges over the canal were the key to allowing Army Group B a high operational tempo. The bridges at Veldwezelt, Vroenhoven and Kanne in Belgium, and Maastricht on the Dutch border were the target.[4] Failure to capture the bridges would leave Reichenau's German 6th Army, the southern-most army of Group B, trapped in the Maastricht-Albert Canal enclave and subjected to the fire of Eben-Emael. The fort had to be captured or destroyed.[4]

Adolf Hitler summoned Lieutenant-General Kurt Student of the 7. Flieger-Division (7th Air Division) to discuss the assault.[4] It was first suggested that a conventional parachute drop be made by airborne forces to seize and destroy the forts' guns before the land units approached. Such a suggestion was rejected as the Junkers Ju 52 transports were too slow and were likely to be vulnerable to Dutch and Belgian anti-aircraft guns.[4] Other factors for its refusal were the weather conditions, which might blow the paratroopers away from the fort and disperse them too widely. A seven-second drop from a Ju 52 at minimum operational height led to a dispersion over 300 metres alone.[4]

Hitler had noticed one potential flaw in the defences.[5] The roofs were flat and unprotected; he demanded to know if a glider, such as the DFS 230, could land on them. Student replied that it could be done, but only by 12 aircraft and in daylight; this would deliver 80–90 paratroopers onto the target.[6] Hitler then revealed the tactical weapon that would make this strategic operation work, introducing the Hohlladungwaffe (hollow-charge) – a 50千克(110英磅) explosive weapon which would destroy the Belgian gun emplacements. It was this tactical unit that would spearhead the first strategic airborne operation in history.[6]

Forces involved

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Belgian forces

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The Belgian Army could muster 22 Divisions,[7] which contained 1,338 artillery pieces but just 10 tanks.[8] The Belgians began mobilisation on 25 August 1939 and by May 1940 mounted a field army of 18 infantry divisions, two divisions of Chasseurs Ardennais (partly motorised) and two motorised cavalry divisions, a force totalling some 600,000 men.[9] Belgian reserves may have been able to field 900,000 men.[10] The army lacked armour and anti-aircraft guns.[9][11] After the completion of the Belgian Army's mobilisation, it could muster five Regular Corps and two reserve Army Corps consisting of 12 regular infantry divisions, two divisions of Chasseurs Ardennais, six reserve infantry divisions, one Brigade of Cyclist Frontier Guards, one Cavalry Corps of two divisions and one Brigade of motorised cavalry.[12] The Army contained two anti-aircraft artillery and four Army artillery regiments and an unknown quantity of fortress, engineer and signals force personnel.[12]

The Belgian Naval Corps was resurrected in 1939. Most of the Belgian Merchant fleet, of some 100 ships, evaded capture by the Germans. Under the terms of a Belgian–Royal Navy agreement these ships, and the 3,350 sailors and crew, were placed under British control for the duration of hostilities.[13] The General headquarters of the Belgian Admiralty were based at Ostend under the command of Major Henry Decarpentrie. The First Naval Division was based at Ostend, while the second and third divisions were based at Zeebrugge and Antwerp.[14]

A Fairey Fox of the Aéronautique Militaire Belge

The Aéronautique Militaire Belge (AéMI), the Belgian Air Force, had barely begun to modernise their aircraft technology. They had ordered the Brewster Buffalo, Fiat CR.42, Hawker Hurricane, Koolhoven F.K.56, Fairey Battle, Caproni Ca.312 light bombers and Caproni Ca.335 fighter-reconnaissance aircraft.[15] Only the Fiats, Hurricanes and Battles had been delivered. The shortage of modern types meant single-seat versions of the Fairey Fox light bomber were being used as fighters.[15] The AéMI possessed 250 combat aircraft. At least 90 were fighter aircraft, 12 were bombers and 12 were reconnaissance aircraft. Only 50 were of reasonably modern standard.[8][9] When including liaison and transport aircraft from all services are added, a total strength of 377 is reached;[16] however only 118 of these were serviceable on 10 May 1940.[17] Of this number around 78 fighters and 40 bombers were operational.[16] The AéMI was put under the command of Paul Hiernaux, who had received his pilot's licence just before the outbreak of the First World War,[18] and had risen to the position of Commander-in-Chief in 1938.[15] Hiernaux organised the service into three air regiments; the first (1er Régiment d'Aéronautique), which contained 60 aircraft, the second (2e Régiment d'Aéronautique), comprising 53 aircraft and the third (3e Régiment d'Aéronautique), with a further 79 machines.[19]

French forces

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The Belgians were afforded substantial support by the French Army. The French 1st Army comprised General René Prioux's Cavalry Corps. The Corps was given the 2nd Light Mechanised Division (2e Division Légère Mécanique, or 2e DLM) and the 3rd Light Mechanised Division (3e DLM), which were allocated to defend the Gembloux gap. The armoured forces consisted of 176 of the formidable SOMUA S35s and 239 Hotchkiss H35 light tanks. Both of these types, in armour and firepower, were superior to most German types.[20] The 3e DLM contained 90 S35s and some 140 H35s alone.[20]

The French 7th Army was assigned to protect the northern-most part of the Allied front. It contained the 1st Light Mechanised Division (1e DLM), the 25th Motorised Division and the 9th Motorised Division. This force would advance to Breda in the Netherlands.[21]

The third French army to see action on Belgian soil was the 9th. It was weaker than both the 7th and the 1st Armies. The 9th Army was allocated infantry divisions, with the exception of the 5th Motorised Division. Its mission was to protect the southern flank of the Allied armies, south of the Sambre river and just north of Sedan. Further south, in France, was the French 2nd Army, protecting the Franco-Belgian border between Sedan and Montmédy. The two weakest French armies were thus protecting the area of the main German thrust.[22]

British forces

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The British contributed the weakest force to Belgium. The B.E.F, under the command of General Lord Gort VC, consisted of just 152,000 men in two Corps of two divisions each. It was hoped to field two armies of two Corps each, but this scale of mobilisation never took place. The I Corps was commanded by Lt-Gen. John Dill, later Lt-Gen. Michael Barker, who was in turn replaced by Major-General Harold Alexander. Lt-Gen. Alan Brooke commanded II Corps. Later the III Corps under Lt-Gen. Ronald Adam was added to the British order of battle. A further 9,392 Royal Air Force (RAF) personnel of the RAF Advanced Air Striking Force under the command of Air Vice-Marshal Patrick Playfair was to support operations in Belgium. By May 1940 the B.E.F had grown to 394,165 men, of whom more than 150,000 were part of the logistical rear area organisations and had little military training.[23] On 10 May 1940, the B.E.F comprised just 10 divisions (not all at full strength), 1,280 artillery pieces and 310 tanks.[24]

German forces

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Army Group B was placed under the command of Fedor von Bock. It was allocated 26 infantry and three Panzer divisions for the invasion of the Netherlands and Belgium.[25] Of the three Panzer Divisions, the 3rd and 4th were to operate in Belgium under the command of the 6th Army's XVI Corps. The 9th Panzer Division was attached to the 18th Army which, after the Battle of the Netherlands, would support the push into Belgium alongside the 18th Army and cover its northern flank.

Armour strength in Army Group B amounted to 808 tanks, of which 282 were Panzer Is, 288 were Panzer IIs, 123 were Panzer IIIs and 66 were Panzer IVs;[26] 49 command tanks were also operational.[27] The 3rd Panzer Division's armoured regiments consisted of 117 Panzer Is, 128 Panzer IIs, 42 Panzer IIIs, 26 Panzer IVs and 27 command tanks.[27] The 4th Panzer Division had 136 Panzer Is, 105 Panzer IIs, 40 Panzer IIIs, 24 Panzer IVs and 10 command tanks.[27] The 9th Panzer, scheduled initially for operations in the Netherlands, was the weakest division with only 30 Panzer Is, 54 Panzer IIs, 123, 66 Panzer IIIs and 49 Panzer IVs.[27]

The elements drawn from the 7th Air Division and the 22nd Airlanding Division, that were to take part in the attack on Fort Eben-Emael, were named Sturmabteilung Koch (Assault Detachment Koch); named after the commanding officer of the group, Hauptmann Walter Koch.[28] The force was assembled in November 1939. It was primarily composed of parachutists from the 1st Parachute Regiment and engineers from the 7th Air Division, as well as a small group of Luftwaffe pilots.[29]

The Luftwaffe allocated 1,815 combat, 487 transport aircraft and 50 gliders for the assault on the Low Countries.[30] The initial air strikes over Belgian air space were to be conducted by IV. Fliegerkorps under General der Flieger Generaloberst Alfred Keller. Keller's force consisted of Lehrgeschwader 1 (Stab. I., II., III., IV.), Kampfgeschwader 30 (Stab. I., II., III.) and Kampfgeschwader 27 (III.).[31] On 10 May Keller had 363 aircraft (224 serviceable) augmented by Generalmajor Wolfram von Richthofen's VIII. Fliegerkorps with 550 (420 serviceable) aircraft. They in turn were supported by Oberst Kurt-Bertram von Döring's Jagdfliegerführer 2, with 462 fighters (313 serviceable).[18]

Keller's IV. Fliegerkorps headquarters would operate from Düsseldorf, LG 1. KG 30 which was based at Oldenburg and its III. Gruppe were based at Marx. Support for Döring and Von Richthofen came from North Rhine-Westphalia and bases in Grevenbroich, Mönchengladbach, Dortmund and Essen.[31]

Battle

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German air superiority operations

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During the evening of 9 May, the Belgian Military attaché in Berlin intimated that the Germans intended to attack the following day. Offensive movement of enemy forces were detected on the border. At 00:10 on 10 May 1940, at General Headquarters an unspecified squadron in Brussels gave the alarm.[32] A full state of alert was instigated at 01:30 am.[33] Belgian forces took up their deployment positions.[32] The Allied armies had enacted their Dyle plan on the morning of 10 May, and were approaching the Belgian rear. King Leopold had gone to his Headquarters near Briedgen, Antwerp.[34]

The Luftwaffe was to spearhead the aerial battle in the low countries. Its first task was the elimination of the Belgian air contingent. Despite an overwhelming numerical superiority of 1,375 aircraft, 957 of which were serviceable, the air campaign in Belgium had limited success overall on the first day.[18] At roughly 04:00, the first air raids were conducted against airfields and communication centres.[32] It still had a tremendous impact on the AéMI, which had only 179 aircraft on 10 May.[35]

Much of the success achieved was down to Richthofen's subordinates, particularly KG 77 and its commander Oberst Dr. Johann-Volkmar Fisser whose attachment to VIII. Fliegerkorps, was noted by Generalmajor Wilhelm Speidel. He commented it "...was the result of the well-known tendency of the commanding general to conduct his own private war".[35] Fisser's KG 77 destroyed the AéMI main bases, with help from KG 54.[35] Fighters from JG 27 eliminated two Belgian squadrons at Neerhepsen, and during the afternoon, I./St.G 2 destroyed nine of the 15 Fiat CR.42 fighters at Brusthem.[35] At Schaffen-Diest, three Hawker Hurricanes of Escadrille 2/I/2 were destroyed and another six damaged when a wave of He 111s caught them as they were about to take off. A further two were lost in destroyed hangars. At Nivelles airfield, 13 CR42s were destroyed.[36] The only other success was KG 27s destruction of eight aircraft at Belesle.[35]

In aerial combat the battles were also were one-sided. Two He 111s, two Do 17s and three Bf 109s were shot down by Gloster Gladiators and Hurricanes. In return, eight Belgian Gladiators, five Fairey Foxs and one CR42 was shot down by JG 1, 21 and 27. No. 18 Squadron RAF sent two Bristol Blenheims on operations over the Belgian front, but lost both to Bf 109s. By the end of the 10 May, the official German figures indicate claims for 30 Belgian aircraft destroyed on the ground, and 14 (plus the two RAF bombers) in the air for 10 losses.[37] The victory claims are likely an undercount. A total of 83 Belgian machines–mostly trainers and "squadron hacks", were destroyed.[35] The AéMI flew only 146 sorties in the first six days.[38] Between 16 May and 28 May, the AéMI flew just 77 operations.[38] It spent most of its time retreating and fuel withdrawing in the face of Luftwaffe attacks.[38]

10–11 May: The border Battles

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The victors of Eben-Emael: Fallschirmjäger of Sturmabteilung Koch

The German planners had recognised the need to eliminate Fort Eben-Emael if it was to break into the interior of Belgium. It decided to deploy airborne forces (Fallschirmjäger) to land inside the fortress perimeter using gliders. Using special explosives (and flamethrowers) to disable the defences, the Fallschirmjäger then entered the fortress. In the ensuing battle, German infantry overcame the defenders of the I Belgian Corps' 7th Infantry Division in 24 hours.[39] The main Belgian defence line had been breached and German infantry of the 18th Army had passed through it rapidly. Moreover, German soldiers had established bridgeheads across the Albert Canal before the British were able to reach it some 48 hours later. The Chasseurs Ardennais further south, on the orders of their commander, withdrew behind the Meuse, destroying some bridges in their wake.[40]

Operation Niwi was designed to ease the route of the Panzer Divisions through the Luxembourg–Belgian routes

Further successful German airborne offensive operations were carried out in Luxembourg which seized five crossings and communication routes leading into France. The offensive, carried out by 125 volunteers of the 34th Infantry Division under the command of Wenner Hedderich, achieved their missions by flying to their objectives using Fieseler Fi 156 Störche. The cost was the loss of five aircraft and 30 dead.[41] With the fort breached, the Belgian 4th and 7th Infantry Divisions were confronted by the prospect of fighting an enemy on relatively sound terrain (for armour operations). The 7th Division, with its 2nd and 18th Grenadier Regiments and 2nd Carabineers, struggled to hold their positions and contain the German infantry on the west bank.[34] The Belgian tactical units engaged in several counterattacks. At one point, at Briedgen, they succeeded in retaking the bridge and blowing it up.[34] At the other points, Vroenhoven and Veldwezeltz, the Germans had had time to establish strong bridgeheads and repulsed the attacks.[34]

A little known third airborne operation, Operation Niwi, was also conducted on 10 May in southern Belgium. The objectives of this operation was to land two companies of the 3rd battalion Großdeutschland Infantry Regiment by Fi 156 aircraft at Nives and Witry in the south of the country, in order to clear a path for the 1st and 2nd Panzer divisions which were advancing through the Belgian–Luxembourg Ardennes. The original plan called for the use of Junkers Ju 52 transport aircraft, but the short landing capability of the Fi 156 (27 metres) saw 200 of these aircraft used in the assault. The operational mission was to:

1. Cut signal communications and message links on the NeufchâteauBastogne and Neufchâteau–Martelange roads. [Neufchâteau being the largest southern-most city in Belgium]

2. Prevent the approach of reserves from the Neufchâteau area

3. Facilitate the capture of pillboxes and the advance by exerting pressure against the line of pillboxes along the border from the rear.[42]

The German infantry were engaged by several Belgian patrols equipped with T-15 armoured cars. Several Belgian counterattacks were repulsed, among them an attack by the 1st Light Ardennes Infantry Division. Unsupported, the Germans faced a counterattack later in the evening by elements of the French 5th Cavalry Division, dispatched by General Charles Huntziger from the French 2nd Army, which had "massive" tank strength. The Germans were forced to retreat. The French, however, failed to pursue the fleeing German units, stopping at a dummy barrier.[43] By the next morning, the 2nd Panzer Division had reached the area, and the mission had largely been accomplished. From the German perspective, the operation hindered rather than helped Heinz Guderian's Panzer Corps.[43] The regiment had blocked the roads and, against the odds, prevented French reinforcements reaching the Belgian–Franco-Luxembourg border, but it also destroyed Belgian telephone communications.[43] This inadvertently prevented the Belgian field command recalling the units along the border. The 1st Belgian Light Infantry did not receive the signal to retreat and engaged in a severe fire-fight with the German armour, slowing down their advance.[43]

The failure of the Franco–Belgian forces to hold the Ardennes gap was a fatal mistake. The Belgians had withdrawn laterally upon the initial invasion and had demolished and blocked routes of advance, which held up the French 2nd Army units moving north toward Namur and Huy. Devoid of any centre of resistance, the German assault engineers had cleared the obstacles unchallenged. The delay that the Belgian Ardennes Light Infantry, considered to be an elite formation, could have inflicted upon the advancing German armour was proved by the fight for Bodange, where the 1st Panzer Division was held up for a total of eight hours. This battle was a result of a breakdown in communications and ran contrary to the operational intentions of the Belgian Army.[44]

An abandoned Belgian T13 tank, May 1940

Meanwhile, in the central Belgian sector, having failed to restore their front by means of ground attack, the Belgians attempted to bomb the bridges and positions that the Germans had captured intact and were holding on 11 May. An unspecified squadron which attempted to do so lost eleven out of twelve aircraft during one mission.[34] The German counter-air operations were spearheaded by Jagdgeschwader 26 under the command of Hans-Hugo Witt, which was responsible for 82 of the German claims in aerial combat between 11 and 13 May.[45] Despite the apparent success of the German fighter units, the air battle was not one-sided.[45] On the morning of 11 May ten Junkers Ju 87 Stukas of Sturzkampfgeschwader 2 were shot down attacking Belgian forces in the Namur–Dinant gap, despite the presence of two Jagdgeschwader27 and 51.[45] Nevertheless, the Germans reported a weakening in Allied air resistance in northern Belgium by 13 May.[45]

During the night of 11 May, the British 3rd Infantry Division under the command of General Bernard Law Montgomery, reached its position on the Dyle river at Leuven. As it did so the Belgian 10th Infantry Division, occupying the position, mistook them for German parachutists and fired on them. The Belgians refused to yield but Montgomery claimed to have got his way by placing himself under the command of the Belgian forces, knowing that when the Germans came within artillery range the Belgians would withdraw.[21]

Alan Brooke, commander of the British II Corps sought to put the matter of cooperation right with King Leopold. The King discussed the matter with Brooke, who felt a compromise could be reached. Van Overstraeten, the King's military aide, stepped in and said that the 10th Belgian Infantry Division could not be moved. Instead, the British should move further south and remain completely clear of Brussels. Brooke told the King that the 10th Belgian Division was on the wrong side of the Gamelin line and was exposed. Leopold deferred to his advisor and chief of staff. Brooke found Overstaeten to be ignorant of the situation and the dispositions of the B.E.F. Given that the left flank of the B.E.F rested on its Belgian ally, the British were now unsure about Belgian military capabilities.[21] The Allies had more serious grounds for complaint about the Belgian anti-tank defences along the Dyle line, that covered the Namur–Perwez gap which was not protected by any natural obstacles.[21][46] Only a few days before the attack, General Headquarters had discovered the Belgians had sited their anti-tank defences (de Cointet defences) several miles east of the Dyle between Namur–Perwez.[21]

After holding onto the Albert Canal's west bank for nearly 36 hours, the 4th and 7th Belgian infantry divisions withdrew. The capture of Eben-Emael allowed the Germans to force through the Panzers of the 6th Army. The situation for the Belgian divisions was either to withdraw or be encircled. The Germans had advanced beyond Tongres and were now in a position to sweep south to Namur, which would threaten to envelope the entire Albert Canal and Liege positions. Under the circumstances, both divisions withdrew.[47] On the evening of 11 May, the Belgian Command withdrew its forces behind the Namur–Antwerp line. The following day, the French 1st Army arrived at Gembloux, between Wavre and Namur, to cover the "Gembloux gap". It was a flat area, devoid of prepared or entrenched positions.[47]

The French 7th Army, on the northern flank of the Belgian line, protected the BrugesGhentOstend axis and, covering the Channel ports, had advanced into Belgium and into the Netherlands with speed. It reached Breda in the Netherlands, on 11 May. But German parachute forces had seized the Moerdijk bridge on the Hollands Diep river, south of Rotterdam, making it impossible for the French to link up with the Dutch Army. The Dutch Army withdrew north to Rotterdam and Amsterdam.[48] The French 7th Army turned east and met the 9th Panzer Division about 20千米(12英里) east of Breda at Tilburg. The battle resulted in the French retiring, in the face of Luftwaffe air assaults, to Antwerp. It would later help in the defence of the city.[49] The Luftwaffe had given priority to attacking the French 7th Army's spearhead into the Netherlands as it threatened the Moerdijk bridgehead. Kampfgeschwaders 40 and 54 supported by Ju 87s from VIII. Fliegerkorps helped drive them back.[50] Fears of Allied reinforcements reaching Antwerp forced the Luftwaffe to cover the Scheldt estuary. KG 30 bombed and sank two Dutch gunboats and three Dutch destroyers, as well as badly damaging two Royal Navy destroyers. But overall the bombing had a limited effect.[50]

12–14 May: Battles of the central Belgian plain

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During the night of 11/12 May, the Belgians were fully engaged in withdrawing to the Dyle line, covered by a network of demolitions and rearguards astride Tongres. During the morning of 12 May, King Leopold III, General van Overstraeten, Édouard Daladier, General Alphonse Georges (commander of the First Allied army Group, comprising the B.E.F, French 1st, 2nd, 7th and 9th Armies), General Gaston Billotte (coordinator of the Allied Armies) and General Henry Royds Pownall, Gort's chief of staff, met for a military conference near Mons. It was agreed the Belgian Army would man the Antwerp–Leuven line, while its allies took up the responsibility of defending the extreme north and south of the country.

The Belgian III Corps, and its 1st Chasseurs Ardennais, 2nd Infantry and 3rd Infantry divisions had withdrawn from the Liege fortifications to avoid being encircled. One regiment, the Liege Fortress Regiment, stayed behind to disrupt German communications. Further to the south, the Namur fortress, manned by VI Corps' 5th Infantry Division and the 2nd Chasseurs Ardennais with the 12th French Infantry Division, fought delaying actions and participated in a lot of demolition work while guarding the position.[51] As far as the Belgians were concerned, it had accomplished the only independent mission assigned to it: to hold the Liege–Albert Canal line long enough for the Allied units to reach friendly forces occupying the Namur–Antwerp–Givet line. For the remainder of the campaign, the Belgians would execute their operations in accordance with the overall Allied plan.[51]

Belgian soldiers fought rearguard actions while other Belgian units already on the Dyle line worked tirelessly to organize better defensive positions in the Leuven–Antwerp gap. The 2nd Regiment of Guides and the 2nd Carabineers Cyclists of the 2nd Belgian Cavalry Division covered the retreat of the 4th and 7th Belgian divisions and were particularly distinguished at the Battle of Tirlemont and the Battle of Haelen.[52][53] In light of the withdrawal to the main defensive line, which was now being supported by the British and French Armies, King Leopold issued the following proclamation to improve morale after the defeats at the Albert Canal:

Soldiers

The Belgian Army, brutally assailed by an unparalleled surprise attack, grappling with forces that are better equipped and have the advantage of a formidable air force, has for three days carried out difficult operations, the success of which is of the utmost importance to the general conduct of the battle and to the result of war.
These operations require from all of us – officers and men – exceptional efforts, sustained day and night, despite a moral tension tested to its limits by the sight of the devastation wrought by a pitiless invader. However severe the trial may be, you will come through it gallantly.
Our position improves with every hour; our ranks are closing up. In the critical days that are ahead of us, you will summon up all your energies, you will make every sacrifice, to stem the invasion.
Just as they did in 1914 on the Yser, so now the French and British troops are counting on you: the safety and honour of the country are in your hands.

Leopold.[52]

German Panzer I tanks in western Belgium, May 1940

To the Allies, the Belgian failure to hold onto its eastern frontiers (they were thought to be capable of holding out for two weeks), was a disappointment. The Allied Chiefs of Staff had sought to avoid an encounter mobile battle without any strong fixed defences to fall back on and hoped Belgian resistance would last long enough for a defensive line to be established.[54] Nevertheless, a brief lull fell on the Dyle front on 11 May which enabled the Allied armies to get into position by the time the first major assault was launched the following day. Allied cavalry had moved into position and infantry and artillery were reaching the front more slowly, by rail. Although unaware of it, the First Allied army Group and the Belgian Army outnumbered and outgunned Walther von Reichenau's German 6th Army.[55]

On the morning of 12 May, in response to Belgian pressure and necessity, the Royal Air Force and the Armée de l'Air undertook several air attacks on the German-held Maastricht and Meuse bridges to prevent German forces flowing into Belgium. 74 sorties had been flown by the Allies since 10 May. On 12 May, eleven out of eighteen French Breguet 693 bombers were shot down. The RAF Advanced Air Striking Force, which included the largest Allied bomber force, was reduced to 72 aircraft out of 135 by 12 May. For the next 24 hours, missions were postponed as the German anti-aircraft and fighter defences were too strong.[56]

The results of the bombing is difficult to determine. The German XIX Corps war diary's situation summary at 20:00 on 14 May noted:

The completion of the military bridge at Donchery had not yet been carried out owing to heavy flanking artillery fire and long bombing attacks on the bridging point … Throughout the day all three divisions have had to endure constant air attack — especially at the crossing and bridging points. Our fighter cover is inadequate. Requests [for increased fighter protection] are still unsuccessful.

The Luftwaffe's operations includes a note of "vigorous enemy fighter activity through which our close reconnaissance in particular is severely impeded". Nevertheless, inadequate protection was given to cover RAF bombers against the strength of German opposition over the target area.[57] In all, out of 109 Fairey Battles and Bristol Blenheims which had attacked enemy columns and communications in the Sedan area, 45 had been lost.[57] On 15 May, daylight bombing was significantly reduced.[57] Of 23 aircraft employed, four failed to return. Equally, owing to the Allied fighter presence, the German XIX Corps War Diary states, "Corps no longer has at its disposal its own long-range reconnaissance … [Reconnaissance squadrons] are no longer in a position to carry out vigorous, extensive reconnaissance, as, owing to casualties, more than half of their aircraft are not now available."[57]

General Erich Hoepner commanded XVI Army Corps at the Battle of Hannut and the Gembloux gap offensive

The most serious combat to evolve on 12 May 1940 was the beginning of the Battle of Hannut (12–14 May). While the German Army Group A advanced through the Belgian Ardennes, Army Group B's 6th Army launched an offensive operation toward the Gembloux gap. Gembloux occupied a position in the Belgian plain; it was an unfortified, untrenched space in the main Belgian defensive line.[58] The Gap stretched from the southern end of the Dyle line, from Wavre in the north, to Namur in the south, 20千米(12英里) to 30千米(19英里). After attacking out of the Maastricht bulge and defeating the Belgian defences at Liege, which compelled the Belgian I Corps to retreat, the German 6th Army's XVI Panzer-Motorised Corps, under the command of General Erich Hoepner and containing the 3rd and 4th Panzer Divisions, launched an offensive in the area where the French mistakenly expected the main German thrust.[59][60]

The Gembloux gap was defended by the French 1st Army, with six elite divisions including the 2nd (2e Division Légère Mécanique, or 2e DLM) and 3rd Light Mechanised Divisions.[58] The Prioux Cavalry Corps, under the command of Rene-Jacques-Adolphe Prioux, was to advance 30千米(19英里) beyond the line (east) to provide a screen for the move. The French 1st and 2nd Armoured Divisions were to be moved behind the French 1st Army to defend its main lines in depth.[58] The Prioux Cavalry Corps was equal to a German Panzer Corps and was to occupy a screening line on the TirlemontHannutHuy axis. The operational plan called for the Corps to delay the German advance on Gembloux and Hannut until the main elements of the French 1st Army had reached Gembloux and dug in.[58]

Hoepner's Panzer Corps and Prioux' Cavalry clashed head-on near Hannut, Belgium, on 12 May. Contrary to popular belief, the Germans did not outnumber the French.[61] Frequently, figures of 623 German and 415 French tanks are given.[61] The German 3rd and 4th Panzer Divisions numbered 280 and 343 respectively.[61] The 2e DLM and 3e DLM numbered 176 Somuas and 239 Hotchkiss H35s.[61] Added to this force were the considerable number of Renault AMR-ZT-63s in the Cavalry Corps. The R35 was equal or superior to the Panzer I and Panzer IIs in armament terms.[61] This applies all the more to the 90 Panhard 178 armoured cars of the French Army. Its 25mm main gun could penetrate the armour of the Panzer IV. In terms of tanks that were capable of engaging and surviving a tank-vs-tank action, the Germans possessed just 73 Panzer IIIs and 52 Panzer IVs.[61] The French had 176 SOMUA and 239 Hotchkisses.[61] German tank units also contained 486 Panzer I and IIs, which were of dubious combat value given their losses in the Polish Campaign.[20]

The German forces were able to communicate by radio during the battle and they could shift the point of the main effort unexpectedly. The Germans also practised combined arms tactics, while the French tactical deployment was a rigid and linear leftover from the First World War. French tanks did not possess radios and often the commanders had to dismount to issue orders.[62] Despite the disadvantages experienced by the Germans in armour, they were able to gain the upper hand in the morning battle on 12 May, encircling several French battalions. The combat power of the French 2e DLM managed to defeat the German defences guarding the pockets and freeing the trapped units.[63] Contrary to German reports, the French were victorious on that first day, preventing a Wehrmacht break-through to Gembloux or seizing Hannut.[62] The result of the first day's battle was:

The effect on the German light tanks was catastrophic. Virtually every French weapon from 25mm upward penetrated the 7-13mm of the Panzer I. Although the Panzer II fared somewhat better, especially those that had been uparmoured since the Polish Campaign, their losses were high. Such was the sheer frustration of the crews of these light Panzers in [the] face of heavier armoured French machines that some resorted to desperate expedients. One account speaks of a German Panzer commander attempting to climb on a Hotchkiss H-35 with a hammer, presumably to smash the machine's periscopes, but falling off and being crushed by the tank's tracks. Certainly by day's end, Prioux had reason to claim that his tanks had come off best. The battlefield around Hannut was littered with knocked-out tanks–the bulk of which were German Panzers–with by far and away the bulk of them being Panzer Is and IIs.[64]

The following day, 13 May, the French were undone by their poor tactical deployment. They strung their armour out in a thin line between Hannut and Huy, leaving no defence in depth, which was the point of sending the French armour to the Gembloux gap in the first place. This left Hoepner with a chance to mass against one of the French Light Divisions (the 3e DLM) and achieve a breakthrough in that sector. Moreover, with no reserves behind the front, the French denied themselves the chance of a counterattack. The victory saw the Panzer Corps out-manoeuvre the 2e DLM on its left flank.[62] The Belgian III Corps, retreating from Liege, offered to support the French front held by the 3e DLM. This offer was rejected.[65]

On 12 and 13 May, 2e DLM lost no AFVs, but the 3e DLM lost 30 SOMUAs and 75 Hotchkisses. The French had disabled 160 German tanks.[66] But as the poor linear deployment had allowed the Germans the chance of breaking through in one spot, the entire battlefield had to be abandoned,[66] the Germans repaired nearly three quarters of their tanks; 49 were destroyed and 111 were repaired. They had 60 men killed and another 80 wounded.[67] In terms of battlefield casualties, the Hannut battle had resulted in the French knocking-out 160 German tanks, losing 105 themselves. Prioux had achieved his tactical mission and withdrew.[68]

Hoepner now pursued the retreating French. Being impatient, he did not wait for his infantry divisions to catch up. Instead, he hoped to continue pushing the French back and not give them time to construct a coherent defence line. German formations pursued the enemy to Gembloux. The Panzer Corps ran into retreating French columns and inflicted heavy losses on them. The pursuit created severe problems for the French artillery. The combat was so closely fought that the danger of friendly fire incidents were very real. Nevertheless the French, setting up new anti-tank screens and Hoepner, lacking infantry support, caused the Germans to attack positions head-on. During the following Battle of Gembloux the two Panzer Divisions reported heavy losses during 14 May and were forced to slow their pursuit. The German attempts to capture Gembloux were repulsed.[69]

Although suffering numerous tactical reverses, operationally the Germans diverted the Allied First Army Group from the lower Ardennes area. In the process his forces, along with the Luftwaffe depleted Prioux' Cavalry Corps. When news of the German breakthrough at Sedan reached Prioux, he withdrew from Gembloux. With the Gembloux gap breached, the German Panzer Corps, the 3rd and 4th Panzer Divisions, were no longer required by Army Group B and were handed over to Army Group A. Army Group B would continue its own offensive to force the collapse of the Meuse front. The Army Group was in a position to advance westward to Mons, outflank the B.E.F and Belgian Army protecting the Dyle–Brussels sector, or turn south to outflank the French 9th Army. German losses had been heavy at Hannut and Gembloux.[70] The 4th Panzer Division was down to 137 tanks on 16 May, including just four Panzer IVs. The 3rd Panzer Division was down by 20–25 percent of its operational force, while the 4th Panzer Division 45–50 percent of its tanks were not combat ready.[70] Damaged tanks were quickly repaired, but its strength was initially greatly weakened.[70] The French 1st Army had also taken a battering and despite winning several tactical defensive victories it was forced to retreat on 15 May owing to developments elsewhere, leaving its tanks on the battlefield, while the Germans were free to recover theirs.[71]

15–21 May: Counterattacks and retreat to the coast

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German infantry with a Pak 36 anti-tank gun in western Belgium in May 1940.

On the morning of 15 May, German Army Group A broke the defences at Sedan and was now free to drive for the English Channel. The Allies considered a wholesale withdrawal from the Belgian trap. The withdrawal would reflect three stages: the night of 16/17 May to the River Senne, the night of 17/18 May to the river Dendre and the night of 18/19 May to the river Scheldt.[72][73] The Belgians were reluctant to abandon Brussels and Leuven, especially as the Dyle line had withstood German pressure well.[72] The Belgian Army, the B.E.F and the French 1st Army, in a domino effect, was ordered/forced to retire on 16 May to avoid their southern flanks from being turned by the German armoured forces advancing through the French Ardennes and the German 6th Army advancing through Gembloux. The Belgian Army was holding the German Fourteenth Army on the K.W line, along with the French 7th and British armies. Had it not been for the collapse of the French 2nd Army at Sedan, the Belgians were confident that they could have checked the German advance.[74]

The situation called for the French and British to abandon the Antwerp–Namur line and strong positions in favour of improvised positions behind the Scheldt, without facing any real resistance.[75] In the South, General Deffontaine of the Belgian VII Corps retreated from the Namur and Liege regions,[75] the Liege fortress region put up stiff resistance to the German 6th Army.[76] In the North, the 7th Army was diverted to Antwerp after the surrender of the Dutch on 15 May, but was then diverted to support the French 1st Army.[75] In the centre, the Belgian Army and the B.E.F suffered little German pressure. On 15 May, the only sector to really be tested was around Leuven, which was held by the British 3rd Division. Thereafter the B.E.F was not pursued vigorously to the Scheldt.[72]

After the withdrawal of the French Army from the northern sector, the Belgians were left to guard the fortified city of Antwerp. Four infantry divisions (including the 13th and 17th Reserve Infantry Divisions) engaged the German Eighteenth Army's 208th, 225th and 526th Infantry Divisions.[77] The Belgians successfully defended the northern part of the city, delaying the German infantry forces while starting to withdraw from Antwerp on 16 May. The city fell on 18/19 May after considerable Belgian resistance. On 18 May the Belgians received word that Namur's Fort Marchovelette had fallen; Suarlee fell on 19 May; St. Heribert and Malonne on 21 May; Dave, Maizeret and Andoy on 23 May.[76]

Between 16 and 17 May, the British and French withdrew behind the Willebroek Canal, as the volume of Allied forces in Belgium fell and moved toward the German armoured thrust from the Ardennes. The Belgian I Corps and V Corps also retreated to what the Belgians called the Ghent bridgehead, behind the Dendre and Scheldt. The Belgian Artillery Corps and its infantry support defeated attacks by the Eighteenth Army's infantry and in a communiqué from London, the British recognised the "Belgian Army has contributed largely towards the success of the defensive battle now being fought.[76] Nevertheless, the now-outnumbered Belgians abandoned Brussels and the Government fled to Ostend. The city was occupied by the German Army on 17 May. The very next morning, Hoepner, the German XVI Corps commander, was ordered to release the 3rd and 4th Panzer Divisions to Army Group A.[78] This left the 9th Panzer Division attached to the Eighteenth Army as the only armoured unit on the Belgian front.

By 19 May, the Germans were hours away from reaching the French Channel coast. Gort had discovered the French had neither plan nor reserves and little hope for stopping the German thrust to the channel. He was concerned that the French 1st Army on its southern flank had been reduced to a disorganised mass of "fag-ends", fearing that German armour might appear on their right flank at Arras or Péronne, striking for the channel ports at Calais or Boulogne or north west into the British flank. Their position in Belgium massively compromised, the B.E.F. considered abandoning Belgium and retreating to Ostend, Bruges or Dunkirk, the latter lying some 10千米(6.2英里) to 15千米(9.3英里) inside the French border.[79]

A Belgian Renault ACG1 tank, knocked out during the Battle for Antwerp, 19 May 1940

The proposals of a British strategic withdrawal from the continent was rejected by the War Cabinet and the Chief of the Imperial General Staff (CIGS). They dispatched General Ironside to inform Gort of their decision and to order him to conduct an offensive to the south-west "through all opposition" to reach the "main French forces" in the south [the strongest French forces were actually in the north]. The Belgian Army was asked to conform to the plan, or should they choose, the British Royal Navy would evacuate what units they could.[79] The British cabinet decided that even if the "Somme offensive" was carried out successfully, some units may still need to be evacuated, and ordered Admiral Ramsay to assemble a large number of vessels. This was the beginning of Operation Dynamo.[79] Ironside arrived at British General Headquarters at 06:00 am on 20 May, the same day that continental communications between the France and Belgium were cut.[80] When Ironside made his proposals known to Gort, Gort replied such an attack was impossible. Seven of his nine divisions were engaged on the Scheldt and even if it was possible to withdraw them, it would create a gap between the Belgians and British which the enemy could exploit and encircle the former. The B.E.F had been marching and fighting for nine days and was now running short of ammunition.[80] The main effort had to be made by the French to the south.[80]

The Belgian position on any offensive move was made clear by King Leopold III. As far as he was concerned, the Belgian Army could not conduct offensive operations as it lacked tanks and aircraft; it existed solely for defence.[81][82] The King also made clear that in the rapidly shrinking area of Belgium still free, there was only enough food for two weeks.[81] Leopold did not expect the B.E.F to jeopardize its own position in order to keep contact with the Belgian Army, but he warned the British that if it persisted with the southern offensive the Belgians would be overstretched and their army would collapse.[81][82] King Leopold suggested the best recourse was to establish a beach-head covering Dunkirk and the Belgian channel ports.[81] The will of the CIGS won out. Gort committed just two infantry battalions and the only armoured battalion in the B.E.F to the attack, which despite some initial tactical success, failed to break the German defensive line at the Battle of Arras on 21 May.[83]

In the aftermath of this failure, the Belgians were asked to fall back to the Yser river and protect the Allied left flank and rear areas. The King's aide, General Overstraten said that such a move could not be made and would lead to the Belgian Army disintegrating. Another plan for further offensives was suggested. The French requested the Belgians withdraw to the Leie and the British to the French frontier between Maulde and Halluin, the Belgians were then to extend their front to free further parts of the B.E.F for the attack. The French 1st Army would relieve two more divisions on the right flank. Leopold was reluctant to undertake such a move because it would abandon all but a small portion of Belgium. The Belgian Army was exhausted and it was an enormous technical task that would take too long to complete.[84]

At this time, the Belgians and the British concluded that the French were beaten and the Allied Armies in the pocket on the Belgian–Franco border would be destroyed if action was not taken. The British, having lost confidence in their Allies, decided to look to the survival of the B.E.F.[85]

22–28 May: Last defensive battles

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The Germans advance to the English Channel.

The Belgian battle-front on the morning of 22 May extended some 90千米(56英里). From north to south, beginning with the Cavalry Corps which checked its advance at Terneuzen. V, II, VI, VII and IV Corps (all Belgian), were drawn up side by side. Two further signal Corps were guarding the coast.[86] These formations were now largely holding the eastern front as the B.E.F and French forces withdrew to the west to protect Dunkirk, which was vulnerable to German assault on 22 May. The eastern front remained intact, but the Belgians now occupied its last fortified position at Leie.[87] The Belgian I Corps, with only two incomplete divisions, had been heavily engaged in the fighting and the their line was wearing thin. On that day, Winston Churchill visited the front and pressed for the French and British Armies to break-out from the north-east. He assumed that the Belgian Cavalry Corps could support the offensives' right flank. Churchill dispatched the following message to Gort:

1. That the Belgian Army should withdraw to the line of the Yser and stand there, the sluices being opened.
2. That the British Army and French 1st Army should attack south-west towards Bapaume and Cambrai at the earliest moment, certainly tomorrow, with about eight divisions, and with the Belgian Cavalry Corps on the right of the British.[88]

Such an order ignored the fact that the Belgian Army could not withdraw to the Yser, and there was little chance of any Belgian Cavalry joining in the attack.[88] The plan for the Belgian withdrawal was sound, the Yser river covered Dunkirk to the east and south, while the La Bassée Canal covered it from the west. The ring of the Yser also dramatically shorted the Belgian Army's area of operations. Such a move would have abandoned Passchendaele and Ypres and would have certainly meant the capture of Ostend while further reducing the amount of Belgian territory still free by a few square miles.[89] And of course it would have meanth the loss of all Belgian ports to the East of the Yser, like Zeebrugge and Ostend.

On 23 May, the French tried to conduct a series of offensives against the German defensive line on the Ardennes–Calais axis but failed to make any meaningful gains. Meanwhile, on the Belgian front, the Belgians, under pressure, retreated further, and the Germans captured Terneuzen and Ghent that day. The Belgians also had trouble moving the oil, food and ammunition that they had left.[90] The Luftwaffe had air superiority and made everyday life hazardous in logistical terms. Air support could only be called in by "wireless" and the RAF was operating from bases in southern England which made communication more difficult.[90] The French denied the use of the Dunkirk, Bourbourg and Gravelines bases to the Belgians, which had initially been placed at its disposal. The Belgians were forced to use the only harbours left to them, at Nieuport and Ostend.[90]

Churchill and Maxime Weygand, who had taken over command from Gamelin, were still determined to break the German line and extricate their forces to the south. When they communicated their intentions to King Leopold and van Overstraten on 24 May, the latter was stunned.[91] A dangerous gap was starting to open between the British and Belgians between Ypres and Menen, which threatened what remained of the Belgian front.[91] The Belgians could not cover it, such a move would have overstretched them. Without consulting the French or asking permission from his government, Gort immediately and decisively ordered the British 5th and 50th Infantry Divisions to plug the gap and abandon any offensive operations further south.[91][92]

On the afternoon of 24 May, Von Bock had thrown four divisions, of Reichenau's 6th Army, against the Belgian IV Corps position at the Kortrijk area of the Leie. The Germans managed, against fierce resistance, to cross the river at night and force a one mile penetration along a 13-mile front between Wervik and Kortrijk. The Germans, with superior numbers and in command of the air, had won the bridgehead.[91] Nevertheless, the Belgians had inflicted many casualties and several tactical defeats on the Germans. The 1st, 3rd, 9th and 10th Infantry Divisions, acting as reinforcements, had counterattacked several times and managed to capture 200 German prisoners.[93] Belgian artillery and infantry were then heavily attacked by the Luftwaffe which forced their defeat. The Belgians blamed the French and British for not providing air cover.[93] The German bridgehead dangerously exposed the eastern flank of the southward stretched B.E.F's 4th Infantry Division. Montgomery dispatched several units of the 3rd Infantry Division (including the heavy infantry of the 1st and 7th Middlesex battalions and the 99th Battery, 20th Anti-Tank Regiment), as an improvised defence.[94]

A critical point of the "Weygand Plan" and the British Government and French Army's argument for a thrust south, was the withdrawal of forces to see the offensive through which had left the Belgian Army over-extended and was instrumental in its collapse. It was forced to cover the areas held by the B.E.F in order to enable the latter to engage in the offensive.[91] Such a collapse could have resulted in the loss of the Channel ports behind the Allied front, leading to a complete strategic encirclement. The B.E.F could have done more to counterattack von Bock's left flank to relieve the Belgians as von Bock attacked across the fortified British position at Kortrijk.[95] The Belgian High Command made at least five appeals for the British to attack the vulnerable left flank of the German divisions between the Scheldt and the Leie to avert disaster.[95]

Admiral Sir Roger Keyes transmitted the following message to GHQ:

Van Overstraten is desperately keen for strong British counterattack. Either north or south of Leie could help restore the situation. Belgians expect to be attacked on the Ghent front tomorrow. Germans already have a bridgehead over canal west of Eecloo. There can be no question of the Belgian withdrawal to Yser. One battalion on march NE of Ypres was practically wiped out today in attack by sixty aircraft. Withdrawal over open roads without adequate fighter support very costly. Whole of their supplies are east of Yser. They strongly represent attempt should be made to restore the situation on Leie by British counter-attack for which opportunity may last another few hours only.[96]

No such attack came. The Germans brought fresh reserves to cover the gap (Menen–Ypres). This nearly cut the Belgians off from the British. The 2nd, 6th and 10th Cavalry Divisions frustrated German attempts to exploit the gap in depth but the situation was still critical.[93] On 26 May, Operation Dynamo officially commenced, in which large French and British contingents were to be evacuated to the United Kingdom. By that time the Royal Navy had already withdrawn 28,000 British non-fighting troops. Boulogne had fallen and Calais was about to, leaving Dunkirk, Ostend and Zeebrugge as the only viable ports which could be used for evacuation. The advance of the 14th German Army would not leave Ostend available for much longer. To the west, the German Army Group A had reached Dunkirk and were 4英里(6.4千米) from its centre on the morning of 27 May, bringing the port within artillery range.[97]

The situation on 27 May had changed considerably from just 24 hours earlier. The Belgian Army had been forced from the Leie line on 26 May, and Nevele, Vynckt, Tielt and Iseghem had fallen on the western and central part of the Leie front. In the east the Germans had reached the outskirts of Bruges, and captured Ursel. In the west, the Menen–Ypres line had broken at Kortrijk and the Belgians were now using railway trucks to help form anti-tank defences on a line from Ypres–Passchendaele–Roulers. Further to the west the B.E.F had been forced back, north of Lille just over the French border and was now in danger of allowing a gap to develop between themselves and the Belgian southern flank on the Ypres–Lille axis.[98] The danger in allowing a German advance to Dunkirk would mean the loss of the port which was now too great. The British withdrew to the port on 26 May. In doing so they left the French 1st Army's north-eastern flank near Lille exposed. As the British moved out the Germans moved in, encircling the bulk of the French Army. Both Gort and his Chief of Staff, General Henry Pownall accepted that their withdrawal would mean the destruction of the French 1st Army, and they would be blamed for it.[99]

The fighting of 26–27 May had brought the Belgian Army to the brink of collapse. The Belgians still held the Ypres–Roulers line to the west, and the Bruges–Thelt line to the east. However, on 27 May the central front collapsed in the Iseghem–Thelt sector. There was now nothing to prevent a German thrust to the east to take Ostend and Bruges, or west to take the ports at Nieuport or La Panne, deep in the Allied rear.[98] The Belgians had practically exhausted all available means of resistance. The disintegration of the Belgian Army and its front caused many erroneous accusations by the British.[100] In fact, on numerous occasions, the Belgians had held on after British withdrawals.[100] One example was the taking over of the Scheldt line, where they relieved the British 44th Infantry Division, allowing it to retire through their ranks.[100] Despite this, Gort and to a greater extent Pownall, showed unjust contempt for the Belgians.[100] When it was enquired if any Belgians were to be evacuated, Pownall was reported to have replied, "We don't care a bugger what happens to the Belgians".[100]

Belgian surrender

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The Belgian Army was stretched from Cadzand south to Menin on the river Leie, and west, from Menin, to Bruges without any sort of reserves. With the exception of a few RAF sorties, the air was exclusively under the control of the Luftwaffe, and the Belgians reported attacks against all targets considered an objective, with resulting casualties. No natural obstacles remained between the Belgians and the German Army, retreat was not feasible. The Luftwaffe had destroyed most of the rail networks to Dunkirk, just three roads were left: Bruges–ThouroutDixmude, Bruges–Ghistelles–Nieuport and Bruges–Ostende–Nieuport. Using such axes of retreat was impossible without losses owing to German air supremacy (as opposed to air superiority). Water supplies were damaged and cut off, gas and electricity supplies were also cut. Canals were drained and used as supply dumps for whatever ammunition and food-stuffs were left. The total remaining area covered just 1,700 km², and compacted military and civilians alike, of which the latter numbered some 3 million people.[101] Under these circumstances Leopold deemed further resistance useless. On the evening of 27 May, he requested an armistice.[102]

Churchill sent a message to Keyes the same day, and made clear what he thought of the request:

Belgian Embassy here assumes from King's decision to remain that he regards the war as lost and contemplates [a] separate peace. It is in order to dissociate itself from this that the constitutional Belgian Government has reassembled on foreign soil. Even if present Belgian Army has to lay down its arms, there are 200,000 Belgians of military age in France, and greater resources than Belgium had in 1914 which to fight back. By present decision the King is dividing the Nation and delivering it into Hitler's protection. Please convey these considerations to the King, and impress upon him the disastrous consequences to the Allies and to Belgium of his present choice.[103]

Negotiating the Belgian capitulation

The Royal Navy evacuated General Headquarters at Middelkerke and St. Andrews, east of Bruges, during the night. Leopold III, and his mother Queen Mother Elisabeth, stayed in Belgium to endure five years of self-imposed captivity.[103] In response to the advice of his government to set up a government-in-exile Leopold said, "I have decided to stay. The cause of the Allies is lost."[102] The Belgian surrender came into effect at 04:00 on 28 May. Recriminations abounded with the British and French claiming the Belgians had betrayed the alliance. In Paris, the French Premier Paul Reynaud, denounced Leopold's surrender, the Belgian Premier Hubert Pierlot, informed the people that Leopold had taken action against the unanimous advice of the government. As a result, the king was no longer in a position to govern and the Belgian government-in-exile that was located in Paris (later moved to London following the fall of France), would continue the struggle.[102] The chief complaint was that the Belgians had not given any prior warning that their situation was so serious as to capitulate. Such claims were largely unjust. The Allies had known, and admitted it privately on 25 May through contact with the Belgians, that the latter were on the verge of collapse.[104][105] Churchill's and the British response was officially restrained. This was due to the strong-willed defence of the Belgian defensive campaign presented to the cabinet by Sir Roger Keyes at 11:30 am 28 May.[106] The French and Belgian ministers had referred to Leopold's actions as treacherous, but they were unaware of the true events: Leopold had not signed an agreement with Hitler in order to form a collaborative government, but an unconditional surrender as Commander-in-Chief of the Belgian Armed Forces.[107]

Casualties

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The casualty reports include total losses at this point in the campaign. The figures for the Battle of Belgium, 10–28 May 1940, cannot be known with any certainty.

Belgian casualties

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Belgian casualties stood at:

French casualties

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Numbers for the Battle of Belgium are unknown, but the French suffered the following losses throughout the entire western campaign, 10 May – 22 June:

  • Killed in action: 90,000[109]
  • Wounded: 200,000[109]
  • Prisoners of War: 1,900,000.[109]
  • Total French losses in aircraft numbered 264 from 12 to 25 May, and 50 for 26 May to 1 June.[110]

British casualties

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Numbers for the Battle of Belgium are unknown, but the British suffered the following losses throughout the entire campaign, 10 May – 22 June:

  • 68,111 killed in action, wounded or captured.[111]
  • 64,000 vehicles destroyed or abandoned[111]
  • 2,472 guns destroyed or abandoned[111]
  • RAF losses throughout the entire campaign (10 May – 22 June) amounted to 931 aircraft and 1,526 casualties. Casualties to 28 May are unknown.[111] Total British losses in the air numbered 344 between 12 and 25 May, and 138 between 26 May and 1 June.[110]

German casualties

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The consolidated report of the Oberkommando der Wehrmacht regarding the operations in the west from 10 May to 4 June (German: Zusammenfassender Bericht des Oberkommandos der Wehrmacht über die Operationen im Westen vom 10. Mai bis 4. Juni) reports:[112]

  • Killed in action: 10,232 officers and soldiers[112]
  • Missing: 8,463 officers and soldiers[112]
  • Wounded: 42,523 officers and soldiers[112]
  • Losses of the Luftwaffe from 10 May to 3 June: 432 aircraft[112]
  • Losses of the Kriegsmarine: none[112]

See also

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References

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Notes

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Citations

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  1. ^ 1.0 1.1 1.2 Belgium, Ministère des Affaires Étrangères 1941, pp. 32–33.
  2. ^ Holmes 2001, p. 313.
  3. ^ Bond 1990, pp. 100–101.
  4. ^ 4.0 4.1 4.2 4.3 4.4 Dunston 2005, p. 34.
  5. ^ Dunston 2005, p. 35.
  6. ^ 6.0 6.1 Dunston 2005, p. 36.
  7. ^ Bond & Taylor 2001, p. 37.
  8. ^ 8.0 8.1 Keegan 2005, p. 324.
  9. ^ 9.0 9.1 9.2 Keegan 2005, p. 95.
  10. ^ Fowler 2002, p. 12.
  11. ^ Frieser 2005, p. 36.
  12. ^ 12.0 12.1 Belgium, Ministère des Affaires Étrangères 1941, p. 32.
  13. ^ 13.0 13.1 13.2 Keegan 2005, p. 96.
  14. ^ Niehorster, Leo. Belgian Navy Order of Battle. [3 February 2010]. 
  15. ^ 15.0 15.1 15.2 Hooton 2007, p. 49.
  16. ^ 16.0 16.1 Frieser 2005, p. 47.
  17. ^ Frieser 2005, p. 46.
  18. ^ 18.0 18.1 18.2 Hooton 2007, p. 48.
  19. ^ Aéronautique Militaire Belge. [3 February 2010].  使用|coauthors=需要含有|author= (帮助)
  20. ^ 20.0 20.1 20.2 Healy 2007, p. 37.
  21. ^ 21.0 21.1 21.2 21.3 21.4 Bond 1990, p. 58.
  22. ^ Foot 2005, p. 322. (map of French dispositions is available in Keegan's book)
  23. ^ Foot 2005, p. 130.
  24. ^ Foot 2005, p. 324.
  25. ^ Bond 1975, p. 20.
  26. ^ Prigent & Healy 2007, p. 32.
  27. ^ 27.0 27.1 27.2 27.3 Healy 2007, p. 32.
  28. ^ Harclerode, p. 51
  29. ^ Tugwell, p. 52
  30. ^ Hooton 2007, p. 47.
  31. ^ 31.0 31.1 Hooton 2007, pp. 45–46.
  32. ^ 32.0 32.1 32.2 Belgium, Ministère des Affaires Étrangères 1941, p. 33.
  33. ^ Sebag-Montefiore 2006, pp. 50–51.
  34. ^ 34.0 34.1 34.2 34.3 34.4 Belgium, Ministère des Affaires Étrangères 1941, p. 35.
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