Gongsun Kang
In 207, Cao Cao's army headed north to attack the Wuhuan, defeating them at the Battle of White Wolf Mountain. Tadun was killed in battle while Yuan Xi and Yuan Shang sought refuge under Gongsun Kang, a warlord who controlled most of present-day Liaoning. Gongsun Kang feared that the Yuans might turn against him and seize his territory, so he had them executed and sent their heads to Cao Cao. By this time, the Yuan clan had been eliminated and much of northern China had been reunified under Cao Cao's control.