On March 10, 1945, the United States sent 334 B-29 bombers to raid Japan with 279 of the planes dropping 1,665 tons of bombs on Tokyo. Approximately 15.8 square miles of the city was destroyed and some 100,000 people are estimated to have died.
Operation Meetinghouse — “The bombs were mostly the 500-pound E-46 cluster bombs which released 38 napalm-carrying M-69 incendiary bomblets at an altitude of 2,000–2,500 ft. The M-69s punched through thin roofing material or landed on the ground; in either case they ignited 3–5 seconds later, throwing out a jet of flaming napalm globs.” (Wikipedia)