After defeating France in June 1940, Hitler assumed Britain would sue for peace but ordered his armed forces to prepare for invasion. Hermann Goering assured him that a sustained air assault would destroy the RAF, winning the air superiority needed.
July 1940 saw German planes target shipping in the Channel, drawing the RAF into combat, before radar stations, communications centres and airfields faced round-the-clock bombing in August. The battle reached a climax with attacks on London in September.
Joan 'Elizabeth' Mortimer, Elspeth Henderson and Helen Turner of the WAAF. All three received the Military Medal for courageous conduct during attacks on Biggin Hill airfield. Biggin Hill suffered a total of ten major attacks between 30 Aug and 5 Sept.
A group of pilots of No. 303 (Polish) Squadron RAF return from a sortie. The first Polish squadrons were formed in the summer of 1940. Pilots came from several other countries, including Australia, Canada, Czechoslovakia, New Zealand and the USA.
RAF Duxford was a Sector Station in 12 Group, responsible for defending the Midlands and East Anglia. As the fighting intensified, Duxford's squadrons were called on to support 11 Group's defence of London and the south-east.
Despite incessant attacks, the RAF's defences held. The Luftwaffe could not continue, and in the autumn switched to 'nuisance' raids and night operations. The failure to defeat the RAF convinced Hitler to postpone his invasion plans indefinitely.
Captured Polish troops march out of the capital, Warsaw, after the city was taken by the Germans on 27 September 1939. The Polish Army was large, but poorly equipped and thinly spread. It lacked the means to counter Germany's modern armoured forces.

Captured Polish troops march out of the capital, Warsaw, after the city was taken by the Germans on 27 September 1939. The Polish Army was large, but poorly equipped and thinly spread. It lacked the means to counter Germany's modern armoured forces.
photographs
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Blitzkrieg ('Lightning War') was the method of offensive warfare responsible for Nazi Germany’s military successes in the early years of the war.
Combined forces of tanks, motorised infantry and artillery penetrated an opponent’s defences on a narrow front, bypassing pockets of resistance and striking deep into enemy territory. The Luftwaffe provided close air support, bombing key objectives and establishing local air superiority. Radio communications were the key to effective Blitzkrieg operations, enabling commanders to co-ordinate the advance and keep the enemy off balance.
These techniques were used to great effect in 1939, when the Polish Army was destroyed in a series of encirclement battles. In May 1940 Hitler attacked France, his panzer divisions smashing through slow-moving French formations and cutting off the British Expeditionary Force at Dunkirk. Spectacular success was also achieved during the invasion of the Soviet Union in 1941, with large numbers of Russian troops being captured.
But Blitzkrieg was less successful against properly organised defences. The flanks of rapidly advancing mobile forces were vulnerable to counter-attack. Soviet commanders learned to blunt German assaults with successive defence lines of guns and infantry. By 1943 the days of Blitzkrieg were over, and Germany was forced into a defensive war on all fronts.


A German infantry column marches past a destroyed French horse-drawn column, May 1940. Despite the popular image of Blitzkrieg, the bulk of the German Army still advanced on foot, and most of its artillery and supplies were horse-drawn.
photographs


Tank Recovery during the Retreat to the Coast, France: June 1940, by Richard Seddon. This drawing shows a damaged light tank being hauled onto a wheeled truck during the retreat of the British Expeditionary Force to Dunkirk in May 1940. The artist, Corporal Richard Seddon, was serving with the Royal Army Ordnance Corps in France when he produced this drawing, one of a series he completed during May and June 1940.
art


On the Road to Louvain, May 1940, by Edward Ardizzone. This watercolour depicts aline of British troops moving along the road from Brussels to Louvain (or Leuven in Flemish) in Belgium, with a procession of refugees and horse-carts fleeing in the opposite direction in the face of the German advance. German aircraft sometimes strafed the columns of refugees to spread further panic and disruption.
art


The German invasion of Belgium began on 10 May 1940. Belgian defences were quickly overwhelmed by Blitzkrieg tactics, which combined artillery, infantry and tanks with close support from the Luftwaffe. In this photograph, taken in May 1940, Belgian civilians take cover in a roadside ditch during an air raid.
photographs


German commemorative plate marking the invasion of Belgium and France in 1940. This commemorative plate records the participation of Panzerjäger-Abteilung 171 (71 Infantry Division) during the invasion of Belgium and France in 1940. The illustration on the plate shows the route taken by Germany's Army Group A through the Ardennes forest, bypassing the defences of the Maginot Line. The date shown on the calendar is 10 May 1940, the date that the invasion was launched.
souvenirs and ephemera