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(Sunday, September 15, 1940, 10:10 a.m.-10:48 p.m. BST; during Battle of Britain Day, the climax of the Battle of Britain, part of the Western Front of World War II) — The German Luftwaffe launched its largest and most concentrated attack against London today in the hope of drawing out the Royal Air Force into a battle of annihilation.

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Around 1,500 aircraft took part in the air battles which lasted until dusk.

RAF Fighter Command defeated the German raids. The Luftwaffe formations were dispersed by a large cloud base and failed to inflict severe damage on the city of London.

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In the aftermath of the raid, Hitler postponed Operation Sea Lion. Having been defeated in daylight, the Luftwaffe turned its attention to The Blitz night campaign which lasted until May 1941.