 Liu Shan then granted Jiang Wan permission to create a personal staff to assist him in administering state affairs.In April or May of the following year, he gave Jiang Wan an additional appointment as Grand Marshal ().Jiang Wan considered that one reason for the failure of Zhuge Liang's Northern Expeditions against Wei was that he chose the difficult route through the Qin Mountains; the mountainous terrain had made it difficult for the Shu army to navigate their way and transport their supplies to the frontline.