what day when hiroshima was dropped
More On This Day. On This Day: United States Drops Atomic Bomb on Hiroshima. On Aug. 6, 1945, U.S. war plane Enola Gay dropped âLittle Boy,â a 8,900-pound atomic bomb, on Hiroshima, Japan. Within eight days, Japan surrendered, ending World War II. The United States and Japan had been at war since 1941.