The Invasion of Lingayen Gulf 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. 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 9 January, the U.S. 6th Army landed on a 20 mi (32 km) beachhead between the towns of Lingayen and San Fabian.
During World War II, the Lingayen Gulf proved a strategically important theater of war between American and Japanese forces. On 22 December 1941, the Japanese 14th Army—under Lieutenant General Masaharu Homma—landed on the Eastern part of the gulf at Agoo, Caba, Santiago and Bauang, where they engaged in a number of relatively minor skirmishes with the defenders, which consisted of a poorly-equipped contingent of predominantly American and Filipino troops, and managed to successfully invade and occupy the gulf. Following the defeat, the next day General Douglas MacArthur issued the order to retreat from Luzon and withdraw to Bataan. For the next three years, the gulf remained under Japanese occupation prior to the Lingayen Gulf Landings.
Beginning on 6 January 1945, a heavy naval and air bombardment of suspected Japanese defenses on Lingayen began. Underwater demolitions began, but found no beach obstacles, and encountered sparse opposing forces. Aircraft and naval artillery bombardment of the landing areas also occurred, with kamikazes attacking on the 7th. On the 8th, it was observed that in the town of Lingayen, as a response to the pre-landing bombardment, Filipinos had begun to form a parade, complete with United States and Philippine flags; fire was shifted away from that area.
At 09:30 on 9 January 1945, about 68,000 men under General Walter Krueger of the U.S. 6th Army—following a devastating naval bombardment—landed at the coast of Lingayen Gulf meeting no opposition. A total of 203,608 soldiers were eventually landed over the next few days, establishing a 20 mi (32 km) beachhead, stretching from Sual, Lingayen and Dagupan (XIV Corps) to the west, and San Fabian (I Corps) to the east. The total number of troops under the command of MacArthur was reported to have even exceeded the number that Dwight D. Eisenhower controlled in Europe. Within a few days, the assault forces had quickly captured the coastal towns and secured the 20 mile long beachhead, as well as penetrating up to five miles inland.
Despite their success in driving out the Japanese forces stationed there, they suffered relatively heavy losses; particularly to their convoys, due to kamikaze attacks. From 4–12 January, a total of 24 ships were sunk and another 67 were damaged by kamikazes; including the battleships USS Mississippi, New Mexico and Colorado (the latter was accidentally hit by friendly fire), the heavy cruiser HMAS Australia, the light cruiser USS Columbia, and the destroyers USS Long and USS Hovey. Following the landings, the Lingayen Gulf was turned into a vast supply depot for the rest of the war to support the Battle of Luzon.
On 9 January 2008, Gov. Amado Espino, Jr. and Vice Gov. Marlyn Primicias-Agabas institutionalized the commemoration to honor the war veterans. The resolution named 9 January as Pangasinan Veterans' Day. In the 63rd anniversary commemoration of the Lingayen Gulf Landing, President Fidel Ramos appealed to U.S. President George W. Bush for 24,000 surviving war veterans, to pass two legislative bills pending since 1968 at the US House of Representatives — the Filipino Veterans' Equity Act of 2006 and the Filipino Veterans' Equity of 2005 sponsored by former Senator Daniel Inouye.