The heaviest bombing took place during The Blitz between 7 September 1940 and 10 May 1941 . During this period , London was subjected to 71 separate raids receiving over 18,000 tonnes of high explosive . One raid in December 1940 , which became known as the Second Great Fire of London , saw a firestorm engulf much of the City of London and destroy many historic buildings . St Paul 's Cathedral , however , remained unscathed ; a photograph showing the Cathedral shrouded in smoke became a famous image of the war
Second Great Fire of London
Second Great Fire of London
History of London