高順
Yuan Shu was unable to come to Lü Bu's aid. Cao Cao could not conquer Xiapi despite pressing attacks on the city and his men were growing weary. He wanted to abort the campaign and return to Xu, but his advisors Guo Jia and Xun You urged him to press on. He then ordered his troops to direct the waters of the Yi (沂) and Si (泗) rivers to flood Xiapi. After a siege lasting three months, the morale of Lü Bu's forces fell drastically and his men gradually alienated him. On 7 February 199, Lü Bu's subordinates Hou Cheng, Song Xian (宋憲) and Wei Xu (魏續) captured Chen Gong and Gao Shun, and then led their troops to surrender to Cao Cao.