《北史·列传·卷三十八》
后来，妖贼李洪在阳城叛乱，勾结蛮族，朝廷下诏命费穆兼武卫将军，率兵进讨，将他击破。
后妖贼李洪于阳城起逆，连结蛮左，诏穆兼武卫将军击破之。
Later, the rebel Li Hong colluded with the barbarians in a rebellion in Yangcheng. The court appointed Fei Mu as the General of Wulin Guards. He was ordered to lead troops to an expedition and defeat the rebellion.