Dasheng's Sudden Change

Shengli three years: Xiao Yuan, Taizu of Sheng, was assassinated in the Tianyun Corridor and died on his way back to Beijing due to ineffective treatment. Cao Feng and Huo Ponu of Dongzhou mutinied and killed the governor Gu Beihan. After hearing the news, the Northern Warlord He Lanjin sent troops and was surrounded by the princes. There was a mutiny within the Northern Army, He Lanjin died in battle, and Dasheng collapsed.