During the battle of Tong Pass, Cao Cao invited his enemy and old mate Han Sui to a tea party in the middle of the battlefield. Ma Chao found this all to be quite suspicious, but remained calm. When Han Sui returned to his camp, he had a letter with him. It read "To hell with justice, Cao Cao is pretty cool". Ma Chao roared with fury and sliced off Han Sui's arm. Han Sui had to go to Hua Tuo and get a new mechanical arm. He used his new arm to strangle Hua Xiong.