Before the outbreak of World War II, the Polish government signed an agreement with the Royal Air Force. According to the appendix to the Polish-British Alliance, in the event of war with Germany, two Polish bomber squadrons were to be created on British soil. However, following the German invasion of Poland and subsequent Soviet invasion of Poland, most of the Polish airmen who got to the west were incorporated into the Polish Air Forces being created in France. It was not until the fall of France that Polish airmen started to arrive in the United Kingdom in large numbers. Polish evacuees and refugees with experience in aerial warfare were initially housed in a military camp in Eastchurch. On 1 July 1940, the No. 300 Polish Bomber Squadron was created as the first such Polish units at RAF Bramcote, as a part of the Polish Air Forces in Great Britain. As there were a large number of Polish airmen, often with experience in combat against the Germans from Poland and France, additional bomber squadrons were created by 24 July. Between 19 July 1940 and 8 May 1945, the crews of the squadron flew 3,891 sorties and spent 20,264 hours in the air. Initially equipped with Fairey Battlelight bombers, the squadron was equipped with Vickers Wellington medium bombers on 16 November 1940. The squadron used several variants, including Mark IC, IV, III and X. In 1941 while the unit was equipped with Wellingtons and flying from Hemswell on 'Gardening' operations, the squadron's Intelligence Officer was Michael Bentine, later to become well known as an entertainer. On 5 March 1944 the unit was re-equipped with Avro Lancaster bombers and continued to use that bomber until the end of World War II. During the war, the squadron took part in most of the notable air offensives in Europe, including attacks on Nazi Germany'sKriegsmarine preparing for Operation Seelöwe, also ships such as the docked in Brest, France, other naval facilities in Wilhelmshaven and its U-boat facilities in St. Nazaire, Millennium Offensive on large bombing raids on Cologne, bombing raids on V-weapon sites, D-Day, in support of crossing the Rhine, the Battle of the Ruhr, the bombing of Hamburg and the Battle of Berlin. A number of the crew members were in late 1942 attached to the RAF Tempsford based No. 138 Squadron RAF as the newly formed Flight C operating the Handley Page Halifax. The last mission was flown on 25 April 1945 against Adolf Hitler's residence in Berchtesgaden. The unit was disbanded on 2 January 1947, after the Allies withdrew their support for the Polish government in exile.
