The Battle of Britain was a notable phase of the Second World War, an aerial conflict taking place between 1940 and 1941. Its intent was to wipe out the air combat capabilities of the United Kingdom, prior to an invasion by Nazi-controlled Germany.
The Battle of Britain was one of Julian Bashir and Miles O'Brien's favourite holoprograms at Quark's holosuites. The pair were intent on recreating the historical setting exactly, and had their own costumes. O'Brien even abandoned his Irish accent for his role. (DS9: "Homefront")