Guan Yu's face caused Lu Chang's army to flee in terror

As a result of his arguments and protest, Lu Chang got command of two thousand troops, whom he led to the river. And there he found Guan Yu already arrayed for battle. Guan Yu at once rode out, and the bold Lu Chang was going to attack him. But his soldiers were panic-stricken at the sight of Guan Yu's fierce countenance and ran away. Lu Chang called them to come back, but they would not stop, and as Guan Yu came on with a rush, the army of Wei again lost the day. Many were slain, and the remainder ran into Fancheng. Cao Ren sent off a hasty messenger for help and a letter to Xuchang to tell what Guan Yu had done and how Fancheng was in imminent danger of falling (Romance of the Three Kingdoms, Ch 73).