Pang De
In the meantime, Cao Cao ordered Zhong Yao to recruit forces from Liang Province to deal with Guo Yuan and Gao Gan. Ma Teng, a warlord in Liang Province, responded to Zhong Yao's call and sent his son Ma Chao and an officer Pang De to assist Zhong Yao in attacking Guo Yuan and Gao Gan at Pingyang County (平陽縣; west of present-day Linfen, Shanxi). Pang De led the vanguard, slew Guo Yuan in the midst of battle and took his head, without knowing that the man he killed was Guo Yuan. After the battle, when Zhong Yao's men searched the battlefield, they found Guo Yuan's headless body. Shortly after, Pang De went to meet Zhong Yao and he threw Guo Yuan's head in front of him. Zhong Yao cried when he recognised Guo Yuan's head because Guo Yuan was his maternal nephew. Pang De immediately apologised to Zhong Yao, who replied, "Even though Guo Yuan was my nephew, he was an enemy of the state. Why do you apologise?"