《水经注·卷二》
到了柳中，派了校尉关宠分兵到高昌壁，去攻打交河城，车师投降了。于是又派耿恭的军吏范羌，领兵两千去迎接耿恭。
至柳中，以校尉关宠分兵入高昌壁，攻交河城，车师降，遣恭军吏范羌将兵二千人迎恭。
When they arrived at Liuzhong, they sent Colonel Guan Chong to separate his troops to Gaochang Bi to attack the city of Jiaohe. The Cheshi surrendered. They then sent Geng Gong's military officer Fan Qiang to lead two thousand troops to meet Geng Gong.