張郃
In 215, when Cao Cao launched a campaign against Zhang Lu in Hanzhong Commandery, he first sent Zhang He to lead an army ahead to attack Liang Xing () and the Di tribal king, Dou Mao (). He ordered Zhang He to lead 5,000 infantry to clear the path after entering Hanzhong via San Pass (散關; southwest of present-day Baoji, Shaanxi). After receiving Zhang Lu's surrender, Cao Cao headed back and left behind Xiahou Yuan, Zhang He and other generals to defend Hanzhong from his rival Liu Bei, who controlled Yi Province (covering present-day Sichuan and Chongqing) directly south of Hanzhong.