Jia Xu
Henceafter, Cao Cao had sent forces to attack Zhang Xiu for years without success. In 200, however, Zhang Xiu heeded the suggestion from his adviser, Jia Xu, and surrendered to Cao Cao again. Cao Cao decided to put aside his past feud with Zhang Xiu and accept his surrender. He also proposed a marriage between his son Cao Jun and Zhang Xiu's daughter.