He was promoted to organize Communist guerrilla movements in northern China from a headquarters in Tianjin in 1928, but he was arrested and imprisoned by Kuomintang police in 1931. In 1936, with the tacit support of the Communist Party, Bo signed an anti-communist confession to secure his release. After his release Bo returned to Shanxi, rejoined the communists, and fought both the Kuomintang and the Japanese Empire in northern China until the Communists completed their unification of mainland China in 1949.