Yuan Xi
During Cao Cao's siege on Ye, Yuan Tan did not help attack Ye but sought to take Yuan Shang's territories, defeating Yuan Shang in Zhongshan. Yuan Shang fled further north to join Yuan Xi in You Province. Cao Cao now accused Yuan Tan of breaching the trust in the alliance so he turned east to attack him, capturing Yuan Tan's last stronghold at Nanpi (南皮; in present-day Cangzhou, Hebei) and killing Yuan. Meanwhile, in You Province, Yuan Xi's subordinate Jiao Chu (焦觸) revolted and surrendered to Cao Cao, forcing Yuan Xi and Yuan Shang to flee further north to join the Wuhuan tribes under chief Tadun. Around this time, Gao Gan also rebelled against Cao Cao but was defeated by 206 and killed while attempting to flee south to join Liu Biao.