For six months after its entrance into World War II, America suffered defeat after defeat against Japanese forces in the Pacific. However, America ended its string of losses in June 1942 during a three-day battle near the island of Midway. The stunning victory changed the course of the war in the Pacific. Carrier-based U.S. planes sunk four Japanese aircraft carriers, permanently damaging Japan's fearsome carrier force and allowing the U.S. Navy to gain the strategic advantage.