In 238, the Shu emperor Liu Shan issued an imperial decree to Jiang Wan as follows: "The enemy has yet to be defeated. Cao Rui is arrogant and vicious. The people in the three commanderies in Liaodong have long suffered from tyranny so they have decided to band together and break free from Wei rule. Cao Rui has sent an army to attack Liaodong and suppress the rebellion. In the past, the fall of the Qin dynasty started with an uprising led by Chen Sheng and Wu Guang. The rebellion in Liaodong is a Heaven-granted opportunity for us. You should prepare the troops for battle, mobilise them and get them ready in Hanzhong. Once Wu makes a move, both the east and west will launch a coordinated attack on Wei and seize the opportunity to secure victory."