In 1937, the National Party forced the Japanese army to invade Shanghai on October 12, 1937 (September 9, 1937) and finally agreed with the Communist Party of China on the formation of the Red Army Guard in the southern provinces to form the fourth Army, appointed as Chief of the National Revolutionary Army in the northern Jiangsu and Zhejiang provinces to conduct the anti-Japanese Guard War. On October 12, 1937, the National Party Military Committee of the Communist Party of the Communist Party of China officially announced that the Red Army and Guard of the eight provinces of the south (excluding the Jiangsu Red Army Guard) had been invaded by the Communist Party of China and the Communist Party of China to form the fourth Army, named by the Central Committee of the Communist