《北史·列传·卷三十八》
他带兵围攻武牢关，即将攻克，元天穆北渡黄河，他失去了后援部队，便投降了元颢。
穆围武牢，将拔，属天穆北度，既无后继，穆遂降颢。
He led his troops to besiege Wulao Pass. He was about to capture it when Yuan Tianmu crossed the Yellow River to the north. He lost his reinforcements and surrendered to Yuan Hao.