Battle of Britain Day
Battle of Britain Day is held on September 15. United Kingdom. This event in the second decade of the month September is annual. 
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The name comes from a speech by the Prime Minister of Great Britain, Winston Churchill. After Germany had overrun France, he said that "the Battle of France is over. The Battle of Britain is about to begin."
On Sunday 15 September 1940, the Luftwaffe launched its largest and most concentrated attack against London in the hope of drawing out the RAF into a battle of annihilation. Around 1,500 aircraft took part in the air battles which lasted until dusk. It was the first battle in history waged almost exclusively in the air. The battle included one of the earliest uses of radar in combat.
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