《元史·列传·卷二十八》
至正十八年，山东义军分兵进逼京都，朝廷恐慌，征调四方元军来保卫，令察罕帖木儿屯兵涿州。
十八年，山东贼分道犯京畿。朝廷征四方兵入卫，诏察罕帖木儿以兵屯涿州。
In the 18th year of the Zhisheng period, the Shandong rebels sent troops to advance towards the capital, which panicked the imperial court. They called on Yuan troops from all directions to defend the capital, and ordered Chaghan Temür to station troops in Zhuozhou.