Between 7 September 1940 and 21 May 1941, 16 British cities suffered aerial raids with at least 100 long tons of high explosives. Over a period of 267 days, London was attacked 71 times, Birmingham, Liverpool and Plymouth eight times, Bristol six, Glasgow five, Southampton four, Portsmouth and Hull three and a minimum of one large raid on eight other cities. This was a result of a rapid escalation starting on 24 August 1940, when night bombers aiming for RAF airfields drifted off course and accidentally destroyed several London homes, killing civilians, combined with the UK Prime Minister Winston Churchill's retaliatory bombing of Berlin on the following night.[clarification needed] COUNT 5
QSN1 What was the beginning date of the aerial raids on Great Britain? ANS1 7 September 1940 QSN2 How many days did the aerial raids on Great Britain last? ANS2 267 days QSN3 How many times was London attacked? ANS3 71 times QSN4 Who was the UK Prime Minster at the time of the aerial raids? ANS4 Winston Churchill QSN5 What city did Winston Churchill bomb in retaliation for the killing of civilians?  ANS5 Berlin