Answer:
4. August 15, 1940 (Thursday)
In the biggest air engagement of the Battle of Britain up to this point, the Luftwaffe attempted to overwhelm the RAF with a series of major air attacks. The Germans lost 76 aircraft to the British 34, and to the Germans the day became known as Black Thursday.
5. One of Hitler's key strategic blunders of the war was to consistently underestimate the will and courage of the British people and total lack of preparedness for the winter is another confounding mistake
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mehrin