As the American and Philippine Army fell back into Bataan they established a series of defensive lines across the peninsula. The eastern portion of the first line, the Abucay Line, was to be manned by the 57th Infantry Regiment. The 57th was a regiment of the excellent Philippine Scouts. The 57th Infantry established themselves just south of the Mabatang Creek around the East Road. The Scouts had plenty of time to construct a formidable prepared defensive position. On the night of January 11th, the Japanese, continuing their march down the East Road ran into the Scoutís position. The Japanese crept up through a large cane field and launched themselves at the Philippine position. The Scouts held on, with every available Scout and weapon being thrown into the line including old mortar tubes using 75mm ammunition and a self-propelled gun.