 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.However, due to poor health, Jiang Wan was unable to set his plan into motion.