 During this time, he considered that the land-based route through the Qin Mountains used by Zhuge Liang during the Northern Expeditions was too difficult for navigation and transportation of supplies.He thus came up with a plan to switch to a water-based route along the Han River targeting Wei territories in present-day southern Shaanxi and northwestern Hubei.However, the Shu government rejected his plan as they thought it was too risky.