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No.300 'Mazowiecki' Squadron was a Polish-manned bomber squadron that served with Bomber Command for most of the Second World War, and survived until 1947.
The squadron was formed on 1 July 1940 and was manned by Poles who had escaped from both the fall of Poland and of France. At first it was equipped with the dangerously obsolete Fairey Battle, but in August these were replaced with Wellingtons, and the squadron became part of Bomber Command's main force.
The Wellingtons remained in use until March 1944, and in the following month the squadron converted to the Avro Lancaster. These aircraft were retained for the rest of the war.
July-October 1940: Fairey Battle I
October 1940-December 1941: Vickers Wellington IC
August 1941-January 1943: Vickers Wellington IV
January-April 1943: Vickers Wellington III
March 1943-April 1944: Vickers Wellington X
April 1944-October 1945: Avro Lancaster I and III
July-August 1940: Bramcote
August 1940-July 1941?: Swinderby
July 1941-May 1942: Hemswell
May-June 1942: Ingham
June 1942-January 1943: Hemswell
June 1943-March 1944: Ingham
March 1944-January 1947: Faldingworth
Squadron Codes: BH
1941-1945: Bomber squadron
4 March 1943: No.1 Group; Bomber Command