In February 1936, the Chinese Communist Party organized the Red Army Anti-Japanese Vanguard Army, General Commander Pentecost, General Government Commissioner Mao Zedong, Chief of Staff Jinhua Jinhua, subordinate Red One Army, Red Fifteen Army, Red Twenty-eighth Army group of more than 20,000 people, prepared to pass the mountains to the west, to go to the northern front directly to the Japanese front. On February 17, the Chinese Communist Party issued the Manifesto of the East, announced the Red Army "to the resistance of the day, the river, the river and the east." On December 20, the Eastern Expedition began. The First Army Group and the Fifteenth Army Division, respectively from Shaanxi Province of Qingdao County