《资治通鉴·梁纪·梁纪九》
费穆攻打虎牢城，眼看就要攻取了，听说元天穆向北渡过了黄河，认为这样一来自己便没有了后继援兵，于是便投降了陈庆之。
费穆攻虎牢，将拔，闻天穆北渡，自以无后继，遂降于庆之。
Fei Mu attacked Hulao Pass, and he was about to capture it. He heard that Yuan Tianmu had crossed the Yellow River northwards and thought that he would have no reinforcements, so he surrendered to Chen Qingzhi.