Zhang Heng 張橫

In Chapter 58 of the Romance, Ma Chao, hearing Ma Dai report that his uncle and the younger brothers were all dead, wept and collapsed, and after reading a letter sent by Liu Bei of Jing Province he raised the troops of Xiliang. Then Han Sui, Administrator of Xiliang, summoned Ma Chao and showed him a letter from Cao Cao promising to enfeoff Han Sui as Marquis of Xiliang if he captured Ma Chao and sent him to Xudu. When Ma Chao prostrated himself and asked Han Sui to bind him and send him off, Han Sui said that, having sworn brotherhood with Ma Chao's father, he could not bear to harm him, and promised to help if Ma Chao raised troops. Romance, Ch. 58 §8–12

Han Sui had Cao Cao's envoy dragged out and beheaded, and mustered the troops of the eight divisions under him: Hou Xuan, Cheng Yin, Li Kan, Zhang Heng, Liang Xing, Cheng Yi, Ma Wan and Yang Qiu. The eight generals followed Han Sui, and together with Pang De and Ma Dai under Ma Chao they raised a great army of 200,000 in all and attacked Chang'an. The Xiliang army drove out Zhong Yao, who was defending Chang'an, and took the city, and also drove off Cao Hong and Xu Huang, who were holding Tong Pass. Cao Cao, taking the field in person, was badly defeated by Ma Chao and fled after throwing off his red robe and cutting off his beard with his sword. Romance, Ch. 58 §13–14 · 18–19 · 23–24 · 29

When Cao Cao crossed the Wei River to go north, Han Sui left Ma Chao to guard the camp and, with Pang De as vanguard, led 50,000 troops to Weinan. When Cao Cao's generals lured them on from both sides of the walled road, the thousand-odd armored cavalry led by Pang De fell into pits dug to trap horses, and Han Sui too was trapped in the middle of the encirclement. Pang De cut down Cao Yong, a subordinate general of Cao Ren, and rescued Han Sui, and Ma Chao came out with troops to meet them. When they returned after fighting until sunset and counted their men and horses, they found they had lost the officers Cheng Yin and Zhang Heng, and more than 200 men had died in the pits. In the Romance, Zhang Heng's name appears only in these two passages. Romance, Ch. 58 §40 · 49–51