Dunkirk Evacuation
The Dunkirk Evacuation of 26 May to 4 June 1940, known as Operation Dynamo, was the attempt to save the British Expeditionary Force in France from total defeat by an advancing German army. Nearly 1,000 naval and civilian craft of all kinds, aided by calm weather and RAF air support, managed to evacuate around 340,000 British, French, and Allied soldiers.
The evacuation led to soured Franco-Anglo relations as the French considered Dunkirk a betrayal, but the alternative was very likely the capture of the entire British Expeditionary Force on the Continent. France surrendered shortly after Dunkirk, but the withdrawal allowed Britain and its empire to harbour its resources and fight on alone in what would become an ever-expanding theatre of war.
Germany's Blitzkrieg
At the outbreak of the Second World War when Germany invaded Poland on 1 September 1939, France was relying almost entirely on a single defensive line to protect itself against invasion. These defences were the Maginot Line, a series of mightily impressive concrete structures, bunkers, and underground tunnels which ran along France's eastern frontiers. Manned by 400,000 soldiers, the defence system was named after the French minister of war André Maginot. The French imagined a German attack was most likely to come in two places: the Metz and Lauter regions. As it turned out, Germany attacked France through the Ardennes and Sedan on the Belgian border, circumventing most of the Maginot Line and overrunning the inadequate French defences around the River Meuse, inadequate because the French had considered the terrain in this forested area unsuitable for tanks. Later in the campaign, the Maginot Line was breached near Colmar and Saabrücken.
To bolster the defences of France, Britain had sent across the British Expeditionary Force (BEF) under the command of General John Vereker (better known by his later title Lord Gort, 1886-1946). Around 150,000 men, mostly infantry, had arrived in September 1939 to strengthen the Franco-Belgian border. The BEF included the British Advanced Air Striking Force of 12 RAF squadrons. The aircraft were mostly Hawker Hurricane fighters and a few light bombers, all given much to the regret of RAF commanders who would have preferred to have kept these planes for home defence. The superior Supermarine Spitfire fighters were kept safely in Britain until the very last stages of the battle in France. The BEF had no armoured divisions and so was very much a defensive force, rather than an offensive one. More infantry divisions arrived up to April 1940, so the BEF grew to almost 400,000 men, but 150,000 of these had little or no military training. As General Bernard Montgomery (1887-1976) noted, the BEF was "totally unfit to fight a first class war on the Continent" (Dear, 130). In this respect, both Britain and France were very much stuck in the defensive-thinking mode that had won them the First World War (1914-18). Their enemy was exactly the opposite and had planned meticulously for what it called Fall Gelb (Operation Yellow), the German offensive in the west.
Totally unprepared for a war of movement, the defensive-thinking French were overwhelmed in the middle weeks of May 1940 by the German Blitzkrieg ("lightning war") tactics of fast-moving tanks supported by specialist bombers and smartly followed by the infantry. German forces swept through the three neutral countries of the Netherlands, Luxembourg, and Belgium. The 9th Army punched through the Ardennes and raced in a giant curve through northeast France to reach the coast around Boulogne. The BEF and the northern French armies (7th and 1st) were cut off from the rest of the French forces to the south. Germany had achieved what it called the 'Sickle Slice' (Sichelschnitt). By 24 May, the French and British troops were isolated and with their backs to the English Channel, occupying territory from Dunkirk to Lille. Although there were sporadic counterpunches by the defenders, Gort had already concluded that the French army had collapsed as an operational force. Gort considered an attack on the Germans to the south, which he was ordered to make, would have achieved very little except the annihilation of his army. The BEF must be saved, and so he withdrew to the north.
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