《后汉书·列传·皇甫张段列传》
军吏认为力量不及敌人，叩头阻止，张奂不听，进驻长城，收集兵士，派将王卫招诱东羌，因此占据龟兹，使南匈奴不能与东羌取得联络。
军吏以为力不敌，叩头争止之。奂不听，遂进屯长城，收集兵士，遣将王卫招诱东羌，因据龟兹，使南匈奴不得交通东羌。
The military officials thought their force was inferior to the enemy's, and knocked their heads on the ground to stop Zhang Huan, but Zhang Huan didn't listen, and advanced to the Great Wall, gathered soldiers, and sent general Wang Wei to entice the Eastern Qiang, therefore occupying Qiuci, making it impossible for the Southern Huns to make contact with the Eastern Qiang.