陈炯明
Immediately after his inauguration in May, Sun ordered the Northern Expedition to force the unification of China. In the summer of 1922, Sun Yat-sen personally established the division headquarters in Shaoguan to launch the expedition by coordinating the Guangdong, Yunnan, Jiangxi, and Hunan armies. Sun Yat-sen's Northern Expedition ultimately led to the conflict with Chen Jiongming. Chen Jiongming advocated suspension of military conflict, first building up Guangdong as a province of autonomy. Meanwhile, the Zhili clique started a national movement to reunite the Northern and Southern governments by having the two rival presidents resign in favor of a restored Li Yuanhong. In June, the Northern government's president, Xu Shichang stepped down, and the original National Assembly reconvened in Beijing. To Chen Jiongming, the Constitutional Protection Movement's purpose was achieved, but for Sun the new government was a smokescreen to mask Cao Kun's rule. On June 16, the presidential palace was shelled by Chen's forces. Sun Yat-sen, Chiang Kai-shek, Chen Ce, and the loyalists were safely escorted by ship to Shanghai.