The first raid of this type on Tokyo was on the night of 23–24 February when 174 B-29s destroyed around one square mile (3 km2) of the city. Following on that success, as Operation Meetinghouse, 334 B-29s raided on the night of 9–10 March, of which 282 Superforts reached their targets, dropping around 1,700 tons of bombs. Around 16 square miles (41 km2) of the city was destroyed and over 100,000 people are estimated to have died in the fire storm. It was the most destructive conventional raid, and the deadliest single bombing raid of any kind in terms of lives lost, in all of military aviation history, even when the missions on Hiroshima and Nagasaki are taken as single events. The city was made primarily of wood and paper, and the fires burned out of control. The effects of the Tokyo firebombing proved the fears expressed by Admiral Yamamoto in 1939: "Japanese cities, being made of wood and paper, would burn very easily. The Army talks big, but if war came and there were large-scale air raids, there's no telling what would happen."