Yuan Shang
Internal conflict did break out between Yuan Tan and Yuan Shang later, which resulted in Yuan Tan being defeated by his younger brother. Yuan Tan retreated to Pingyuan () and sent Xin Pi to meet Cao Cao, agreeing to surrender to Cao and requesting for assistance in dealing with Yuan Shang. Cao Cao led his forces north and defeated Yuan Shang at the Battle of Ye in 204. In 205, Cao Cao attacked Yuan Tan on some pretence and defeated him at the Battle of Nanpi. By then, Cao Cao had pacified most of Ji Province in northern China. In recognition of his contributions, the Han imperial court enfeoffed Guo Jia as the Marquis of Weiyang Village ().