《北史·列传·卷十五》
当初，太武帝准备北征，征发民间的驴用以运粮，派公孙轨率部到雍州负责此事。
初，太武将北征，发驴以运粮，使轨部调雍州。
At that time, Emperor Taiwu was preparing to conquer the north, and he conscripted donkeys from the民间 to transport grain, and sent Gongsun Gui to lead his troops to Yongzhou to be in charge of this matter.