《北史·列传·卷四十七》
建德四年，武帝东征，命他攻打轵关以及黄河以北各县，他都一一打破。
四年，武帝东征，令穆别攻轵关及河北诸县，并破之。
In the fourth year of Jiande, Emperor Wu launched an eastward expedition and ordered him to attack Zhigguan Pass and various counties north of the Yellow River. He defeated all of them one by one.