The Invasion of Lingayen Gulf (Filipino: Paglusob sa Golpo ng Lingayen), 6–9 January 1945, was an Allied amphibious operation in the Philippines during World War II. In the early morning of 6 January 1945, a large Allied force commanded by Admiral Jesse B. Oldendorf began approaching the shores of Lingayen from Lingayen Gulf, on the island of Luzon. U.S. Navy and Royal Australian Navy warships began bombarding suspected Japanese positions along the coast of Lingayen from their position in Lingayen Gulf for three days. On "S-Day", 9 January, the U.S. 6th Army landed on a roughly 25 mi (40 km) beachhead at the base of the Gulf between the towns of Lingayen and San Fabian.