《汉书·传·匈奴传上》
在退军路上，破坏了光禄徐自为修筑的城堡哨所。又派右贤王侵入酒泉、张掖，掠走几千人。
又使右贤王入酒泉、张掖，略数千人。
When retreating, they demolished observation towers and fortifications erected by the imperial emissary Xu Ziwu.  In addition, they dispatched the Right Worthy King to invade Jiuquan and Zhangye, capturing several thousand people.