Wei Yan was the most powerful general in Shu Han at that time. He is resourceful and brave, and Ma Dai can't compare with him at all. Wei Yan himself was sharp-edged and a powerful character, so many people were afraid to provoke him at that time, including Ma Dai. Later, after Zhuge Liang's death, Wei Yan and Yang Yi were fighting for the military power. Wang Ping spread bad words about Wei Yan everywhere, saying some gossip and slandering Wei Yan. But also let the soldiers leave Wei Yan and stop working for Wei Yan, so Wei Yan's soldiers fled one after another.
Without the fighting capacity of the army soldiers, Wei Yan quickly fled. He fled to Hanzhong with his son and several people. Yang Yi completely killed Wei Yan, sent Ma Dai to catch up with Hanzhong, and finally killed Wei Yan. Although Ma Dai's combat capability was not as good as Wei Yan's, Ma Dai led thousands of soldiers to pursue Wei Yan, who was only a few dozen at that time. No matter how strong Wei Yan is, it is impossible to beat so many people. Later, Ma Dai became a Pingbei general and was appointed as Chen Canghou. It can be described as fame and fortune.
And before Ma Dai's brother Ma Chao died, he entrusted Ma Chao to Liu Bei, hoping that Liu Bei could take care of Ma Dai more, because he had only one relative left. But later in the battle of Jiangling, Ma Dai disappeared, and no one knew where he went.