After the death of Sun Yat-sen in 1925 the mood was changing in the party toward the communists. In August the left-wing KMT leader Liao Zhongkai was assassinated and the right-wing leader Hu Hanmin, the suspected mastermind, was exiled to the Soviet Union, leaving the pro-communist Wang Jingwei in charge. Opposing communist encroachment, the right-wing Western Hills Group vowed to expel the communists from the KMT. The "Canton Coup" on 20 March 1926 saw Chiang solidify his control over the Nationalists and their army against Wang Jingwei, the party's left wing, its Communist allies, and its Soviet advisors. By May, he had ended civilian control of the military and begun his Northern Expedition against the warlords of the north. Its success led to the split of the KMT between Wuhan and Nanking and the purge of the communists in the April 12 Incident. Immediately afterwards Canton joined the purge under the auspice of Li Jishen, resulting in the arrest of communists and the suspension of left wing KMT apparatuses and labor groups. Later in 1927 when Zhang Fakui, a general supportive of the Wuhan faction seized Canton and installed Wang Jingwei's faction in the city, the communists saw an opening and launched the Guangzhou Uprising. Prominent communist military leaders Ye Ting and Ye Jianying led the failed defense of the city. Soon, control of the city reverted to Li Jishen.