護法運動
After Feng Guozhang had restored him as premier, Duan Qirui quickly began preparations to mobilize troops for conquest of the south. The south responded by forming another rival government against the north and organizing the Constitutional Protection Movement. Duan dispatched two former subordinates of Feng Guozhang to the south to conquer Hunan, the linchpin of central China; one of these commanders was Wu Peifu. Wu supported Feng's preference for peaceful reconciliation with the south and refused to fight. Embarrassed by this fiasco, Duan was forced to resign a second time as premier in November 1917.