《资治通鉴·汉纪·汉纪二》
楚军于是便攻下了成皋，接着又打算西进。汉王即派兵在巩县抵御楚军，使他无法西进。
楚拔成皋，欲西；汉使兵距之巩，令其不得西。
The Chu army then seized Chenggao and planned to march west. The King of Han deployed troops to resist the Chu army at Gongxian, not allowing it to move westward.