Cao Cao and Xiahou Yuan later rendezvoused with Xu Huang 's main army at Anding Commandery ( 安定郡 ; around present-day Zhenyuan County , Gansu ) .
Xu Huang and Xiahou Yuan later rendezvoused with Cao Cao 's main army at Anding Commandery ( 安定郡 ; around present-day Zhenyuan County , Gansu ) .