皖系
In November 1919 Zhili clique leader Gen. Wu Peifu met with representatives of Tang Jiyao and Lu Rongting at Hengyang, where they signed a treaty entitled "Rough Draft of the National Salvation Allied Army" (救国同盟军草约). This formed the basis of a true anti-Anhui clique alliance. In April 1920, while visiting a memorial service at Baoding for soldiers who died in Hunan, one-time presidential-candidate Cao Kun added more warlords to the anti-Anhui clique alliance, including the rulers of Hubei, Henan, Liaoning, Jilin, Heilongjiang, Jiangsu, Jiangxi and Zhili. The conflict became public as both sides began deploying for the coming war.