In January 213, after seeing another astronomical phenomenon, Zhou Qun predicted that the warlords in western China would lose their territories. At the time in western China, Liu Zhang controlled Yi Province (covering present-day Sichuan and Chongqing), Zhang Lu controlled Hanzhong Commandery, Han Sui controlled Liang Province (涼州; covering present-day Ningxia and parts of Gansu, Qinghai, Xinjiang and Inner Mongolia), and Song Jian (宋建) ruled Fuhan County (枹罕縣; southwest of present-day Linxia, Gansu). In the following year, the warlord Cao Cao sent his subordinates to lead troops to attack the various warlords in Liang Province. By early 214, Cao Cao's forces had eliminated Song Jian and defeated Han Sui, who met his end while taking shelter under the Qiang tribes following his defeat. By the autumn of 214, the warlord Liu Bei had defeated Liu Zhang and seized control of Yi Province from him. In the autumn of 215, Cao Cao defeated Zhang Lu at the Battle of Yangping and conquered Hanzhong Commandery.