桂系
During the Central Plains War, the Guangdong 4th Army supported the New Guangxi Clique in opposing Chiang. During the combined forces' entry into Hengyang, their line of retreat was cut off by Jiang Guangnai and Cai Tingkai. In the ensuing Battle of Hengyang, the combined Guangdong-Guangxi army suffered a serious defeat. The Guangdong 4th Army was forced to join Chiang, Zhang Fakui was forced to resign, and Xue was promoted to command of the army.