Operation Ten-Go (天號作戰 (Kyūjitai) or 天号作戦 (Shinjitai), Ten-gō Sakusen?) was the last major Japanese naval operation in the Pacific Theater of World War II. Other renderings of this operation's title in English include Operation Heaven One and Ten-ichi-gō.
In April 1945, the Japanese battleship Yamato, the largest battleship in the world, along with nine other Japanese warships, embarked from Japan on a deliberate suicide attack upon Allied forces engaged in the Battle of Okinawa. The Japanese force was attacked, stopped, and almost completely destroyed by United States (U.S.) carrier-borne aircraft before reaching Okinawa. Yamato and five other Japanese warships were sunk.
The battle demonstrated U.S. air supremacy in the Pacific theater by this stage in the war and the vulnerability of surface ships without air cover to aerial attack. The battle also exhibited Japan's willingness to sacrifice large numbers of its people in desperate attempts (see kamikaze) to slow the Allied advance on the Japanese home islands.
As a final precursor to the invasion of Japan, Allied troops began attacking Okinawa on April 1, 1945. A month prior, realizing that Okinawa would be the Allies' next target, Emperor Hirohito convened a meeting to discuss plans for the island's defense.