The Long March In the early 1930s, amid continued Political Bureau opposition to his military and agrarian policies and the deadly annihilation campaigns being waged against the Red Army by Chiang Kaishek's forces, Mao's control of the Chinese Communist movement increased. The epic Long March of his Red Army and its supporters, which began in October 1934, would ensure his place in history. Forced to evacuate their camps and homes, Communist soldiers and government and party leaders and functionaries numbering about 100,000 (including only 35 women, the spouses of high leaders) set out on a circuitous retreat of some 12,500 kilometers through 11 provinces, 18 mountain ranges, and 24 rivers in southwest and northwest China. During the Long March, Mao finally gained unchallenged command of the CCP, ousting his rivals and reasserting guerrilla strategy. As a final destination, he selected southern Sha'anxi Province, where some 8,000 survivors of the original group from Jiangxi Province (joined by some 22,000 from other areas) arrived in October 1935. The Communists set up their headquarters at Yan'an, where the movement would grow rapidly for the next ten years. Contributing to this growth would be a combination of internal and external circumstances, of which aggression by the Japanese was perhaps the most significant. Conflict with Japan, which would continue from the 1930s to the end of World War II, was the other force (besides the Communists themselves) that would undermine the Nationalist government.