《汉书·传·西域传下》
匈奴听说车师投降汉朝，发兵进攻车师，碰上郑吉、司马憙率军北上，匈奴兵不敢前进。
匈奴闻车师降汉，发兵攻车师，吉、憙引兵北逢之，匈奴不敢前。
The Xiongnu heard that the Cheshi had surrendered to the Han, they sent troops to attack the Cheshi, and met Zheng Ji and Sima Xi leading troops north, the Xiongnu soldiers dared not advance.