Although President of China, his direct rule only extended to the lower Yangtse provinces; the rest of China continued to be ruled by warlords expressing greater or lesser degrees of loyalty to Chiang. In 1929-30 his erstwhile allies Feng Yuxiang and Yan Xishan rebelled against him and his rule was saved by the intervention of [[Zhang Xueliang]], heir of the assassinated north-eastern warlord Zhang Zuolin. | Although President of China, his direct rule only extended to the lower Yangtse provinces; the rest of China continued to be ruled by warlords expressing greater or lesser degrees of loyalty to Chiang. In 1929-30 his erstwhile allies Feng Yuxiang and Yan Xishan rebelled against him and his rule was saved by the intervention of [[Zhang Xueliang]], heir of the assassinated north-eastern warlord Zhang Zuolin. |