《资治通鉴·唐纪·唐纪二十二》
阿史那默啜于是杀死先到的三个人，赐给后到的二人红袍，让他们充当向导，发兵进取契丹所筑新城，杀死被他们俘虏的原唐朝凉州都督许钦明祭天；突厥包围新城，三天后攻陷，全部俘虏该城的契丹人，让乙冤羽迅速报告孙万荣新城失守的消息。
默啜乃杀前三人而赐二人绯，使为乡导，发兵取契丹新城，杀所获凉州都督许钦明以祭天；围新城三日，克之，尽俘以归。使乙冤羽驰报万荣。
Ashina Simo then killed the three who had arrived first, gave red robes to the two who had arrived later, and asked them to act as guides. He sent troops to attack the new city built by the Khitans, killing Xu Qinming, the former governor of Liangzhou of the Tang Dynasty who had been captured by them, and offering a sacrifice to heaven; The Turks surrounded the new city and captured it after three days, capturing all the Khitans in the city and ordering Yiyuan Yu to quickly report the news of the fall of the new city to Sun Wanrong.