Li Zongren
In February 1929, Li Zongren fired the pro-Chiang governor of Hunan but Chiang objected and the two clashed in March, leading to Li's defeat and (temporary) expulsion from the KMT by the third party congress. Feng Yuxiang rebelled on May 19 but was humiliated when half of his army defected through bribery. From October to February, fighting resumed with Wang Jingwei and Lin Sen joining the opposition. In May 1930, the Central Plains War erupted, pitting Chiang against the Beiping faction of Yan Xishan, Feng Yuxiang, Li Zongren, and Wang Jingwei. Though victorious, Chiang's government was bankrupted.