 Opposing the U.S. Army's VIII Corps, commanded by Major General Arthur MacArthur, were Philippine forces under the command of Brigadier General Maximino Hizon, Servillano Aquino, Pio del Pilar, Venancio Concepcion, and Tomas Mascardo.The fighting was fierce and bloody and even though Colonel Alberto San Miguel and a General Makabulos brought fresh reinforcements, the Filipinos finally had to withdraw.They took up positions on the Mabalacat side of the Abacan River and remained there until 5 November, when American cavalry flanking movements rendered these positions untenable.