Dunkirk evacuation
The Dunkirk evacuation, codenamed Operation Dynamo and also known as the Miracle of Dunkirk, or just Dunkirk, was the evacuation of more than 338,000 Allied soldiers during the Second World War from the beaches and harbour of Dunkirk, in the north of France, between 26 May and 4 June 1940. The operation began after large numbers of Belgian, British, and French troops were cut off and surrounded by German troops during the six-week Battle of France.
After Germany invaded Poland in September 1939, France and the British Empire declared war on Germany and imposed an economic blockade. The British Expeditionary Force was sent to help defend France. After the Phoney War of October 1939 to April 1940, Germany invaded Belgium, the Netherlands, and France on 10 May 1940. Three panzer corps attacked through the Ardennes and drove northwest to the English Channel. By 21 May, German forces had trapped the BEF, the remains of the Belgian forces, and three French field armies along the northern coast of France. BEF commander General Viscount Gort immediately saw evacuation across the Channel as the best course of action, and began planning a withdrawal to Dunkirk, the closest good port.
Late on 23 May, the halt order was issued by Generaloberst Gerd von Rundstedt, commander of Army Group A. Adolf Hitler approved this order the next day, and had the German High Command send confirmation to the front. Attacking the trapped BEF, French, and Belgian armies was left to the Luftwaffe until the order was rescinded on 26 May. This gave Allied forces time to construct defensive works and pull back large numbers of troops to fight the Battle of Dunkirk. From 28 to 31 May, in the siege of Lille, the remaining 40,000 men of the French First Army fought a delaying action against seven German divisions, including three armoured divisions.
On the first day, only 7,669 Allied soldiers were evacuated, but by the end of the eighth day, 338,226 had been rescued by a hastily assembled fleet of over 800 vessels. Many troops were able to embark from the harbour's protective mole onto 39 British Royal Navy destroyers, four Royal Canadian Navy destroyers, at least three French Navy destroyers, and a variety of civilian merchant ships. Others had to wade out from the beaches, waiting for hours in shoulder-deep water. Some were ferried to the larger ships by what became known as the Little Ships of Dunkirk, a flotilla of hundreds of merchant marine boats, fishing boats, pleasure craft, yachts, and lifeboats called into service from Britain.
The BEF lost 68,000 soldiers during the French campaign and had to abandon nearly all of its tanks, vehicles, and equipment. In his "We shall fight on the beaches" speech on 4 June to the House of Commons, British Prime Minister Winston Churchill called the event "a colossal military disaster", saying "the whole root and core and brain of the British Army" had been stranded at Dunkirk and seemed about to perish or be captured. He hailed their rescue as a "miracle of deliverance". Churchill also reminded the country that "we must be very careful not to assign to this deliverance the attributes of a victory. Wars are not won by evacuations."
Background
In September 1939, after Germany invaded Poland, the United Kingdom sent the British Expeditionary Force to aid in the defence of France, landing at Cherbourg, Nantes, and Saint-Nazaire. By May 1940 the force consisted of ten divisions in three corps under the command of General John Vereker, 6th Viscount Gort. Working with the BEF were the Belgian Army and the French First, Seventh, and Ninth Armies.During the 1930s, the French had constructed the Maginot Line, a series of fortifications along their border with Germany. This line had been designed to deter a German invasion across the Franco-German border and funnel an attack into Belgium, which could then be met by the best divisions of the French Army. Thus, any future war would take place outside of French territory, avoiding a repeat of the First World War. The area immediately to the north of the Maginot Line was covered by the heavily wooded Ardennes region, which French General Philippe Pétain declared to be "impenetrable" as long as "special provisions" were taken. He believed that any enemy force emerging from the forest would be vulnerable to a pincer attack and destroyed. The French commander-in-chief, Maurice Gamelin, also believed the area to be of a limited threat, noting that it "never favoured large operations". With this in mind, the area was left lightly defended.
The initial plan for the German invasion of France called for an encirclement attack through the Netherlands and Belgium, avoiding the Maginot Line. Erich von Manstein, then Chief of Staff of the German Army Group A, prepared the outline of a different plan and submitted it to the Oberkommando des Heeres via his superior, Generaloberst Gerd von Rundstedt. Manstein's plan suggested that panzer divisions should attack through the Ardennes, then establish bridgeheads on the Meuse River and rapidly drive to the English Channel. The Germans would thus cut off the Allied armies in Belgium. This part of the plan later became known as the Sichelschnitt. Adolf Hitler approved a modified version of Manstein's ideas, today known as the Manstein Plan, after meeting with him on 17 February.
On 10 May, Germany invaded Belgium and the Netherlands. Army Group B, under Generaloberst Fedor von Bock, attacked into Belgium, while the three panzer corps of Army Group A under Rundstedt swung around to the south and drove for the Channel. The BEF advanced from the Belgian border to positions along the River Dyle within Belgium, where they fought elements of Army Group B starting on 10 May. They were ordered to begin a fighting withdrawal to the Scheldt River on 14 May when the Belgian and French positions on their flanks failed to hold. During a visit to Paris on 17 May, Winston Churchill was astonished to learn from Gamelin that the French had committed all their troops to the ongoing engagements and had no strategic reserves. On 19 May, Gort met with French General Gaston Billotte, commander of the French First Army and overall coordinator of the Allied forces. Billotte revealed that the French had no troops between the Germans and the sea. Gort immediately saw that evacuation across the Channel was the best course of action, and began planning a withdrawal to Dunkirk, the closest location with good port facilities. Surrounded by marshes, Dunkirk boasted old fortifications and the longest sand beach in Europe, where large groups could assemble. On 20 May, on Churchill's suggestion, the Admiralty began arranging for all available small vessels to be made ready to proceed to France. After continued engagements and a failed Allied attempt on 21 May at Arras to cut through the German spearhead, the BEF was trapped, along with the remains of the Belgian forces and the three French armies, in an area along the coast of northern France and Belgium.
Prelude
Without informing the French, the British began planning on 20 May for Operation Dynamo, the evacuation of the BEF. This planning was headed by Vice Admiral Bertram Ramsay at the naval headquarters below Dover Castle, from which he briefed Churchill as it was under way. Ships began gathering at Dover for the evacuation. On 20 May, the BEF sent Brigadier Gerald Whitfield to Dunkirk to start evacuating unnecessary personnel. Overwhelmed by what he later described as "a somewhat alarming movement towards Dunkirk by both officers and men", due to a shortage of food and water, he had to send many along without thoroughly checking their credentials. Even officers ordered to stay behind to aid the evacuation disappeared onto the boats.On 22 May, Churchill ordered the BEF to attack southward in coordination with the French First Army under General Georges Blanchard to reconnect with the remainder of the French forces. This proposed action was dubbed the Weygand Plan after General Maxime Weygand, appointed Supreme Commander after Gamelin's dismissal on 18 May. On 25 May, Gort had to abandon any hope of achieving this objective and withdrew on his own initiative, along with Blanchard's forces, behind the Lys Canal, part of a canal system that reached the sea at Gravelines. Sluice gates had already been opened all along the canal to flood the system and create a barrier against the German advance.
Battle of Dunkirk
By 24 May, the Germans had captured the port of Boulogne and surrounded Calais. The engineers of the 2nd Panzer Division under Generalmajor Rudolf Veiel built five bridges over the Canal Line and only one British battalion barred the way to Dunkirk. On 23 May, at the suggestion of Fourth Army commander Generalfeldmarschall Günther von Kluge, Rundstedt had ordered the panzer units to halt, concerned about the vulnerability of his flanks and the question of supply to his forward troops. He was also concerned that the marshy ground around Dunkirk would prove unsuitable for tanks and he wished to conserve them for later operations. Hitler was also apprehensive, and on a visit to Army Group A headquarters on 24 May, he endorsed the order.Air Marshal Hermann Göring urged Hitler to let the Luftwaffe finish off the British. However, General Franz Halder noted in his diary that the Luftwaffe was dependent upon the weather and aircrews were worn out after two weeks of battle. Rundstedt issued another order, which was sent uncoded. It was picked up by the Royal Air Force Y service intelligence network at 12:42: "By order of the Fuhrer ... attack north-west of Arras is to be limited to the general line Lens–Bethune–Aire–St Omer–Gravelines. The Canal will not be crossed." Later that day, Hitler issued Directive 13, which called for the Luftwaffe to defeat the trapped Allied forces and stop their escape. At 15:30 on 26 May, Hitler ordered the panzer groups to continue their advance, but most units took another 16 hours to attack. Some accounts quote Hitler as saying he deliberately allowed the British to escape. The delay gave the Allies time to prepare defences vital for the evacuation and prevented the Germans from stopping the Allied retreat from Lille.
The halt order has been the subject of much discussion by historians. Guderian considered the failure to order a timely assault on Dunkirk to be one of the major German mistakes on the Western Front. Rundstedt called it "one of the great turning points of the war", and Manstein described it as "one of Hitler's most critical mistakes". B. H. Liddell Hart interviewed many of the generals after the war and put together a picture of Hitler's strategic thinking on the matter. He concluded that Hitler believed that once Britain's troops left continental Europe, they would never return.