The Battle of Leyte Gulf is generally considered to be the largest naval battle of World War II and, by some criteria, possibly the largest naval battle in history It was fought in waters near the Philippine islands of Leyte, Samar and Luzon, from 23–26 October 1944, between combined American and Australian forces and the Imperial Japanese Navy. On 20 October, United States troops invaded the island of Leyte as part of a strategy aimed at isolating Japan from the countries it had occupied in Southeast Asia, and in particular depriving its forces and industry of vital oil supplies. The Imperial Japanese Navy (IJN) mobilized nearly all of its remaining major naval vessels in an attempt to defeat the Allied invasion but was repulsed by the U.S. Navy's 3rd and 7th Fleets. The IJN failed to ach