Han Sui
Ma Chao is introduced in Chapter 10, where he participates in a campaign led by his father and Han Sui against Li Jue and Guo Si in Chang'an in 192, during which he slays the enemy officers Wang Fang (王方) and Li Meng (李蒙). He does not reappear until Chapter 57, in which he suggests to his father that he could lead the army against Cao Cao at Xuchang in 211 to follow Emperor Xian's orders to slay Cao Cao, but his father tells him to remain in Liang Province and command the Qiang troops there. After his father is killed by Cao Cao, Ma Chao, Han Sui and another eight officers fight against Cao Cao at the Battle of Tong Pass, during which Ma Chao fights with Cao Cao's generals Xu Chu, Yu Jin, Cao Hong and Zhang He, and slays Li Tong. Later, Cao Cao's strategist, Jia Xu, suggests to Cao Cao to send a letter containing errors and markings (making it seem as though the recipient has something to hide) to Han Sui to make Ma Chao falsely believe that Han Sui is maintaining secret contact with Cao Cao. Ma Chao gradually becomes more suspicious of Han Sui, who also has the intention of defecting to Cao Cao's side after learning that Ma Chao no longer trusts him. Han Sui manages to escape when Ma Chao tries to kill him, but his left hand is cut off by Ma during the fight. Ma Chao is eventually defeated by Cao Cao's forces, but manages to escape and find shelter among the Qiang tribes.