On June 5, 1899, Antonio Luna, Aguinaldo's most capable military commander, was killed by Aguinaldo's guards in an apparent assassination while visiting Cabanatuan, Nueva Ecija to meet with Aguinaldo.[262] With his best commander dead and his troops suffering continued defeats as American forces pushed into northern Luzon, Aguinaldo dissolved the regular army on November 13 and ordered the establishment of decentralized guerrilla commands in each of several military zones.