Both commanders were killed during the battle, and because it was fought in one of the more densely populated areas of the Pacific islands, nearly 100,000 civilians died during the battle, losses nearly equaling those of the Japanese.  
This battle was fought primarily between the U.S. Tenth Army under Simon Buckner and the Japanese 32nd Army under Ushijima Mitsuru.  Both commanders were killed during the battle, and because it was fought in one of the more densely populated areas of the Pacific islands, nearly 100,000 civilians died during the battle, losses nearly equaling those of the Japanese.  For 10 points, name this April 1-June 21, 1945 battle, the last major Pacific island battle of World War II.
This battle was fought primarily between the U.S. Tenth Army under Simon Buckner and the Japanese 32nd Army under Ushijima Mitsuru.  
Battle of Okinawa