303 Squadron accounted for the most enemy kills during the Battle of Britain. Formed on 22 July 1940 at RAF Northolt, the Squadron was made up of Polish airman who had escaped to Britain following the invasion of their country in 1939. Equipped with Hurricanes, 303 Squadron flew in the Battle until mid-October when it was sent to Yorkshire for a much needed rest. The Squadron served for the duration of the war, when it was re-equipped with Spitfires. In 1944 the Squadron was part of 2nd Tactical Air Force which supported the D-Day landings and was then moved to East Anglia to serve as fighter escorts for Bomber Command. The Squadron was disbanded on 11 December 1946.