Ma Zhanshan
After the Marco Polo Bridge Incident, Ma Zhanshan was appointed as Commander of the Northeastern Advance Force, in charge of the four northeastern provinces Liaoning, Jilin, Heilongjiang and Rehe. Ma Zhanshan established a headquarters in Datong in August 1937, led his troops to fight the Japanese in Chahar, Suiyuan Datong and Shanxi, and cooperated with Fu Zuoyi's troops in the defense of Suiyuan and in the Yinshan War.