German bomber flying over Britain during the Blitz.

On the evening of December 29, 1940, London suffers its most devastating
air raid when Germans firebomb the city. Hundreds of fires caused by the
exploding bombs engulfed areas of London, but firefighters showed a
valiant indifference to the bombs falling around them and saved much
of the city from destruction. The next day, a newspaper photo of St. Paul’s Cathedral standing undamaged amid the smoke and flames seemed to
symbolize the capital’s unconquerable spirit during the Battle of Britain.

The dome of St. Paul’s Cathedral in London, visible through smoke generated by German incendiary bombs.