The cause Causation of the war Hostile_encounter was the proclamation Statement by Yuan Shikai , the President of the Republic , of himself as the Hongxian Emperor , Emperor of the Empire of China .

In Yunnan province military leaders including Tang Jiyao , Cai E and Li Liejun declared Expressing_publicly their independence and launched Military_operation military expeditions against Yuan Shikai .

Eventually , under immense pressure from the entire nation , Yuan Shikai was forced Request to abdicate .