On August 14 China entered World War I on the side of the Allies after growing evidence of the German Empire's support for Zhang's coup was uncovered, as well as intense lobbying by Premier Duan Qirui. He sent about 135,000 men in labor battalions to the Western Front, Mesopotamia and German East Africa. Troops were sent into Russia to assist the Allied intervention in Russia's civil war. Sun Yat-sen set up a rival government in Guangzhou during September 1917 and also declared war later that month in a failed attempt to get international recognition. Feng wanted to peacefully resolve the north-south conflict, which led to Duan resigning in protest. Due to pressure from the Anhui clique, he brought Duan back into the premiership. Feng finished the five-year term started by Yuan in 1913 on October 10, 1918, and died in Beijing of illness.