ルソン島の戦い
The Japanese strategy during the Battle of Luzon was to fight a delaying retreat from Baguio to Bayombong, and then to a final defensive position in Kiangan, Ifugao. The pass was the only access between Central Luzon and the Cagayan Valley, and was the scene of much bloody fighting in the Battle of Luzon, during the final stages of World War II.