Jiang Wan
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. Jiang Wan then thought of switching from the land-based route to a water-based one. According to his plan, the Shu forces would construct more warships and sail along the Han River to attack the Wei-controlled Weixing () and Shangyong () commanderies in present-day southern Shaanxi and northwestern Hubei.