《资治通鉴·汉纪·汉纪六十》
关羽知道孙权来信的内容以后，若要回兵保护自己，樊城的包围就迅速解除，我们便可获利。
羽闻权上，若还自护，围则速解，便获其利。
If Guan Yu knew what Sun Quan's later had written, and went back to protect himself, the troops surrounding Fan city would be removed and we would benefit.