Made all of Cao Cao's army jump off their horses and beg

From this it was evident that his design was to release Cao Cao, who then went on with his officers. When Guan Yu turned to look back, they had all passed. He uttered a great shout, and Cao Cao's soldiers jumped off their horses and knelt on the ground crying for mercy. But he also had pity for them. Then Zhang Liao, whom he knew well, came along and was allowed to go free also (Romance of the Three Kingdoms, Ch 50).