临洮县
In 255, despite strong objection from a fellow Shu general Zhang Yi, Jiang Wei went ahead with another campaign against Wei and even brought along Zhang Yi as his deputy. As the massive Shu army prepared to attack Didao (狄道; present-day Lintao County, Gansu), Wang Jing, the Wei governor of Yong Province, sought help from the Wei general Chen Tai.