Around 209 or 210, Jiang Wan came to serve under the warlord Liu Bei, who was also then the Governor of Jing Province (covering present-day Hubei and Hunan), and held the position of a scribe. In 211, he accompanied Liu Bei to Yi Province (covering present-day Sichuan and Chongqing). After Liu Bei seized control of Yi Province in 214, he appointed Jiang Wan as the Chief of Guangdu County (廣都縣; northeast of present-day Shuangliu District, Chengdu, Sichuan).