聯俄容共
Feng and Zhang came to blows when Fengtian Gen. Guo Songling defected to the Guominjun on November 22 and started the Anti-Fengtian War. Six days after this Li Dazhao led a so-called First United Front movement to topple Duan's provisional government, calling it the Capital Revolution. Feng wanted to support this but changed his mind, preferring to concentrate his forces on Zhang's army. As a result, the Capital Revolution movement collapsed.