After the Lugouqiao Incident broke out, according to the agreement reached between the two sides, the Central Military Commission issued an order on August 25th, 1937, which reorganized the Chinese Red Army of Workers and Peasants into the Eighth Route Army of the National Revolutionary Army, with Zhu De as the commander-in-chief and Peng as the deputy commander-in-chief, with about 46,000 people under its jurisdiction. After the adaptation of the Eighth Route Army, the divisions followed the orders of the Central Committee of the Communist Party of China and the Central Military Commission, and set out for Shanxi in August, September and 10 to resist Japan.

In less than a month and a half after the Eighth Route Army advanced into Shanxi, it fought with the Japanese army for more than 20 times, killed nearly 7,000 people, seized and destroyed a large number of Japanese materials, dealt a heavy blow to the Japanese spirit, broke the myth that the Japanese army was invincible, and 1 month defeated the Japanese attempt to embezzle Shanxi.