On July 7, 1937, the Lugouqiao (Marco Polo Bridge) Incident broke out, thus began the nationwide War of Resistance against Japanese Aggression in China. On August 25, 1937, the first, second and forth front armies of the Chinese Workers' and Peasants' Red Army and the Red Army troops in north Shaanxi were redesignated as the Eighth Route Army of the National Revolutionary Army according to the order issued by the CPC Central Military Commission.