In early June, "Yamato" and "Musashi" were again requisitioned as troop transports, this time to reinforce the garrison and naval defenses of the island of Biak as part of Operation Kon. The mission was cancelled when word reached Ozawa's headquarters of American carrier attacks on the Mariana Islands. Instead, the Imperial Japanese Navy reorganized, concentrating the majority of its remaining fighting strength in the hope of achieving a decisive success against the Americans. By this time though, the entire Japanese navy was inferior in numbers and experience to the U.S. Pacific Fleet. From 19 to 23 June 1944, "Yamato" escorted forces of Ozawa's Mobile Fleet during the Battle of the Philippine Sea, dubbed by American pilots "The Great Marianas Turkey Shoot". The Japanese lost three aircraft carriers and 426 aircraft; "Yamato"s only significant contribution was mistakenly opening fire on returning Japanese aircraft.