It was a part of 91st Infantry Division, based in Leyte but was transferred to Luzon to augment the defense there.
[citation needed] 91st Division along with 91st, 92nd Infantry, and 91st Field Artillery was placed as reserve units of the Philippine Army and housed in Camp Tinio in Cabanatuan, Nueva Ecija.
91st Infantry Regiment along with the entire division fought the Japanese onslaught, but was forced to retreat.
[3] General Edward P. King surrendered his battered, exhausted, and hungry troops in order to prevent annihilation on April 9, 1942.
After five months of combat, the troops of combined US and Filipino forces suffered heavy losses and lack of ammunition.