 The first pathfinder airplanes arrived over Tokyo just after midnight on March 10 and marked the target area with a flaming "X".In a three-hour period, the main bombing force dropped 1,665 tons of incendiary bombs, killing 100,000 civilians, destroying 250,000 buildings, and incinerating of the city.Aircrews at the tail end of the bomber stream reported that the stench of burned human flesh permeated the aircraft over the target.