In 1936, under the order of Chiang Kai-shek, and with the help of Ma Zhongying's remnant force in Gansu, and Ma Hongkui's and Ma Hongbin's force from Ningxia, Ma Bufang and his brother Ma Buqing played an important role in annihilating Zhang Guotao's 21,800 strong force that crossed the Yellow River in an attempt to expand the Communist base.