The Battle of the Philippine Sea (June 19–20, 1944) was a decisive naval battle of World War II which effectively eliminated the Imperial Japanese Navy's ability to conduct large-scale carrier actions. It took place during the United States' amphibious invasion of the Mariana Islands during the Pacific War. The battle was the last of five major "carrier-versus-carrier" engagements between American and Japanese naval forces, and involved elements of the United States Navy's Fifth Fleet as well as ships and land-based aircraft from the Imperial Japanese Navy's Mobile Fleet and nearby island garrisons.