Ma Chao
Cao Cao was defeated by Ma Chao in the first skirmish of the battle. In the midst of the chaos, Cao Cao fled and was pursued by Ma Chao. Ma Chao shouted that the man dressed in the red robe was Cao Cao, so Cao took off his robe and discarded it to avoid being recognised. When Ma Chao saw that he shouted again that the man with a long beard was Cao Cao, so Cao drew his sword and quickly trimmed his beard until it was very short. Ma Chao then shouted that the man with a short beard was Cao Cao, and Cao responded by wrapping a flag around his jaw. Cao Hong appeared and held off Ma Chao long enough for Cao Cao to escape.