The significant naval battle in the Pacific Theater that marked a turning point in World War II was the Battle of Midway, fought from June 4 to June 7, 1942. This decisive battle was a crucial victory for the United States Navy and effectively shifted the balance of power in the Pacific against Japan. The U.S. successfully intercepted Japanese plans, allowing American forces to prepare and surprise the Japanese fleet. The victory resulted in the loss of four Japanese aircraft carriers and a substantial number of experienced pilots, weakening Japan's naval superiority and setting the stage for subsequent Allied offensives in the Pacific.