The Battle of Britain was a pivotal moment in World War II, when the Royal Air Force (RAF) successfully defended the United Kingdom against the German Luftwaffe in 1940. It was the first major campaign to be fought entirely by air forces, and marked a turning point in the
From Wikipedia
The Battle of Britain was the fourth of Frank Capra's Why We Fight series of seven propaganda films, which made the case for fighting and winning the Second World War. It was released in 1943 and concentrated on the German bombardment of the United Kingdom in anticipation of Operation Sea Lion, the planned German invasion.