《魏书·列传·卷七》
蠕蠕侵犯边境，外任为使持节、征北大将军、抚冥镇大将。
蠕蠕犯塞，出为使持节、征北大将军、抚冥镇大将。
When the Rouran invaded the border, he was sent out to serve as general in chief of the northern expedition and pacification commander of Mobei (i.e., modern Inner Mongolia).