Ever since the American occupation of the Marianas, Iwo Jima, and Okinawa, the main Japanese islands had been under constant bombardment by long-range bombers of the United States. The city of Tokyo and many other cities on the Japanese mainland were leveled by day-and-night firebomb raids. As Italy and Germany had already done, Japan was paying the price for its grandiose plans for world conquest. But the island nation wasn’t ready to surrender.
Then the United States unveiled the biggest surprise in the history of warfare. It was the deadliest weapon ever designed–the atomic bomb. And although the initial test detonation at Trinity was several times more powerful than scientists had predicted, U.S. officials questioned if it would be enough to compel Japan’s surrender.
On August 6, 1945, “Little Boy” provided an answer.