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.
Photograph of three Avro Lancaster B Mk.Is of 44 (Rhodesia) Squadron flying in formation above the clouds.

Photograph of three Avro Lancaster B Mk.Is of 44 (Rhodesia) Squadron flying in formation above the clouds.
photographs
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The Avro Lancaster, a four-engine heavy bomber, is the most famous and iconic bomber aircraft of the Second World War.
The Lancaster was designed by Roy Chadwick and developed from the twin-engine Avro Manchester. In place of the Manchester’s unreliable and underpowered engines, the Lancaster was fitted with Rolls Royce Merlin engines. The first prototype, BT308, made its maiden flight on 9 January 1941. Development proceeded swiftly and the first Lancasters to enter service were delivered to 44 Squadron at RAF Waddington on Christmas Eve 1941.
Dropping over 600,000 tonnes of bombs in over 156,000 sorties, the Lancaster was responsible for two-thirds of the bombs dropped by Bomber Command over Germany and German-occupied territory between March 1942 and May 1945. The Lancaster is famously associated with Operation 'Chastise', popularly known as the 'Dambusters' raid, which took place on 16-17 May 1943, when modified Lancasters from 617 Squadron attacked three dams in the Ruhr Valley using 'Bouncing Bombs' designed by Barnes Wallis.
Other notable operations in which the Lancaster participated include the sinking of the German battleship Tirpitz in November 1944, and Operation 'Manna' in May 1945, when emergency supplies of food were dropped by parachute to the starving Dutch people.
Of 7,377 Lancasters built, 3,249 were lost in action. In total Bomber Command lost 55,573 men during the Second World War, including a significant number of Lancaster crew.


Photograph of a modified Avro Lancaster of 617 Squadron carrying a 22,000-pound bomb. These specially modified Lancasters could carry the 12,000 and 22,000-pound bombs which were used against the V-weapon bases and the battleshipTirpitz.
photographs


Photograph of Avro Lancaster R5868 'S' for Sugar, surrounded by her crew and other members of No. 467 Squadron RAF after the aircraft had completed 100 operational flights
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Film showing 'Highball' and 'Upkeep' bouncing bomb trials conducted in May 1943 using specially modified Lancasters
film


Record card for Flight Lieutenant Charles Owen listing his operations as a Lancaster Bomber pilot with No. 97 Squadron in 1944
private papers