What is the single most destructive air raid of the war?

A: This was an attack on the capital city of Japan by B-29 bombers on the night of March 9/10, 1945. In three hours 279 bombers released 1660 tons of incendiaries, including large numbers of oil-based incendiary devices on Tokyo. The official Japanese count found 83,793 dead and 40,918 injured. A total of 267,171 buildings were destroyed leaving one million people homeless. 15.8 square miles of the city had been burned to the ground, including 18% of the industrial area, and 63% of the commercial center.

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