Xun Yu
In 194, as Cao Cao led a campaign against Tao Qian in Xu Province, his home base at Yan Province was suddenly attacked by Lü Bu, and two of Cao's officials, Chen Gong and Zhang Miao, chose to defect to Lü Bu. At that time Xun Yu was in charge of the defences of Juancheng (), and his firm actions saved the city from capture, allowing Cao Cao's armies to return and drive away Lü Bu. Subsequently, on the death of Tao Qian, Cao Cao was tempted to turn around and move on Xu Province before returning to deal with Lü Bu; it was Xun Yu who dissuaded him from this, reminding him that Yan Province was his heartland and power base and should be secured first before launching campaigns abroad.