Battle of Britain
Quote of the day: My Luftwaffe is invincible. And now we turn to England. How long will this one last - two, three weeks? –Hermann Goering, June, 1940
The Battle of Britain began on July 10th, 1940 and continued through October 31st, although the issue was more or less decided on September 15th. You can find day-by-day information at BattleOfBritain.net and RAF.mod.uk.