In Chapter 57 of the Romance, when Ma Teng was summoned by Cao Cao, Ma Dai, the son of Ma Teng's elder brother, tried to stop him, fearing he would come to harm. Ma Teng left Ma Dai behind to act in support, and when Ma Teng and his sons were killed, Ma Dai abandoned his troops, disguised himself as a traveling merchant and fled through the night, and in Chapter 58 he brought the news to Ma Chao in Xiliang. Romance, Ch. 57 §42 · 44 · 56Romance, Ch. 58 §8–9
In Chapter 58, as the forward vanguard of the Xiliang army, he led 15,000 troops out and drove off Zhong Yao of Chang'an in a single bout, and at Tong Pass he struck at the rear of the fleeing Cao Hong and Xu Huang. In Chapter 59, separated from Ma Chao in battle, he rescued the encircled Ma Chao together with Pang De, and with the thirty-odd horsemen who remained they set off for Lintao in Longxi. Romance, Ch. 58 §14 · 23Romance, Ch. 59 §33 · 36–37
In Chapter 64 he cut his way out and fled together with Ma Chao, who had been driven from Jicheng, and at Jiameng Pass in Chapter 65 he turned and hit the pursuing Wei Yan in the left arm with an arrow, but against Zhang Fei he was beaten in fewer than ten bouts and fled. Coming over to Liu Bei together with Ma Chao, he called on Liu Zhang to surrender from beneath the walls of Chengdu. In Chapter 92, passing Ma Chao's tomb at Mianyang, Zhuge Liang had Ma Dai put on mourning dress. Romance, Ch. 64 §44Romance, Ch. 65 §12–14 · 38Romance, Ch. 92 §1
In Chapter 88 he arrived at the army of the southern campaign bringing medicine against the heat and grain. When his soldiers collapsed from the poisonous vapors while crossing the Lu River at Shakou, he waited for night to cross, seized Jiashanyu, and captured more than a hundred carts of Meng Huo's grain. He cut down Mangyachang with a single stroke, and later disguised his troops as Man soldiers and rowed a boat to capture Meng Huo. In Chapter 90 he captured Lady Zhurong with a rope stretched to trip horses. Romance, Ch. 88 §7–11 · 15 · 36–37Romance, Ch. 90 §18
In Chapter 94, because he knew the nature of the Qiang well, he went to Xiping Pass as guide for Guan Xing and Zhang Bao, and after the Qiang army was crushed he brought in the Qiang chancellor Yadan. In Chapter 95 he covered the rear together with Jiang Wei and drove off Cao Zhen, and in Chapters 102–103 he guarded the artisans at Shangfang Valley and took charge of the plan to trap Sima Yi with fire, preparing wooden palisades and pits, land mines and dry brushwood. Romance, Ch. 94 §4 · 19Romance, Ch. 95 §39 · 52Romance, Ch. 102 §41Romance, Ch. 103 §15–16
In Chapter 104, before his death, Zhuge Liang summoned Ma Dai into his tent and whispered a secret plan into his ear. In Chapter 105, when Wei Yan proposed going over to Wei, Ma Dai followed him, urging that they first take Hanzhong, and then, before the walls of Nanzheng, when Wei Yan shouted, "Who dares to kill me?", Ma Dai answered from behind, "I dare to kill you!" and cut him down. The Later Sovereign, Liu Shan, gave Wei Yan's rank to Ma Dai for his merit in striking down a rebel. Romance, Ch. 104 §5Romance, Ch. 105 §16–17 · 20–21 · 25