Meng Da was a general during the Three Kingdoms period, and he served Liu Zhang, Liu Bei, and Cao Pi successively. Later, when he was an official in the State of Wei, he secretly contacted Zhuge Liang to defect to Shu Han, and was eventually killed by Sima Yi.
Meng Da was born in Fufeng County, and later fell into Shu in the midst of chaos. At that time, Yizhou Mu Liu Zhang occupied Shu land, so Meng Da defected to Liu Zhang. In the sixteenth year of Jian'an, Liu Zhang and Zhang Lubing of Hanzhong met each other. Liu Zhang listened to the advice of the counselor Zhang Song and invited Liu Bei to Shudi, and in order to show his sincerity, Liu Zhang also specially sent Meng Da and Fazheng to bring 4,000 soldiers and horses to meet Liu Bei.
In the sixteenth year, Liu Zhang, the Mu of Yizhou, heard that Cao Gong would send Chung Sui and others to hanzhong to ask Zhang Lu... The Fa is sending 4,000 people to the Lord, and has left hundreds of millions of people behind. The Biography of the Three Kingdoms Chronicles of the Shu Dynasty
Liu Zhang didn't know that Zhang Song, Meng Da, and Fa Zheng had betrayed him behind his back. When Meng Da and Fa Zheng arrived in Jingzhou, they defected to Liu Bei, and Liu Bei then handed over the four thousand Shu soldiers brought by Meng Da and Fa Zheng to Meng Da, and he took Fa Zheng to attack Shu. After Liu Bei conquered Shudi, he ordered Meng Da to lead his troops and horses from Zigui to attack Fangling. After Meng Da conquered Fangling and then besieged Shangyong County, Liu Bei sent his righteous son Liu Feng to nominally assist Meng Da in attacking Shangyong, but in fact let Liu Feng seize Meng Da's military power.
At the beginning, Liu Zhang sent Fufeng Mengda's deputy Fa Zheng, each with 2,000 soldiers, to meet the lord, and the first lord was ordered to lead his people, leaving Tun Jiangling ... The first lord Yin was afraid that It would be difficult for him to take up his duties alone, so he sent himself from Hanzhong to take the underwater command of the Da army and to meet with Dahui. The Biography of Liu Feng in the Book of the Three Kingdoms
Liu Bei sent Liu Feng to restrain Meng Da, which in itself made Meng Da unhappy. And Liu Feng was young and fierce and was Liu Bei's righteous son, so he acted domineeringly and arbitrarily. Soon after the siege of ShangyongCheng, Meng Da and Liu Feng received a letter of distress from Guan Yu. Meng Da and Liu Feng refused Guan Yu's request for help, and Guan Yu was killed soon after. Meng Da was afraid that Liu Bei would later hold him responsible for Guan Yu's death, and added that he and Liu Feng were at odds. So Meng Da left a farewell letter for Liu Bei and led his men to defect to Cao Pi.
According to Wei Luo in Pei Songzhi's note "Romance of the Three Kingdoms", Meng Da received high courtesy after surrendering to Cao Pi. Meng Da defected to Cao Wei in the first year of Yankang, when Cao Pi had just become the King of Wei. When Cao Pi heard that Meng Da had come and descended, he first sent people to visit Meng Da, and these emissaries praised Meng Da when they returned to give Cao Pi a new life, some people praised Meng Da as a general' talent, and some people praised Meng Da as a Qing Xiang instrument. Cao Pi had also heard about Meng Da's reputation, and after hearing his own people praise Meng Da so much, Cao Pi admired Meng Da even more.
Once Cao Pi jokingly said to Meng Da, "You wouldn't be an assassin sent by Liu Bei, would you?" As soon as he finished speaking, Cao Pi invited Meng Da to ride in a carriage with him. Meng Da, as a general, suddenly became a red man around Cao Pi, which caused many people to be dissatisfied. Cao Pi made Meng Da a regular attendant and led xincheng Taishou (Cao Pi merged the three cities of Fangling, Shangyong, and Xicheng into Xincheng). Sima Yi and others believed that Meng Da was a clever person who could not be reused, but Cao Pi vouched for Meng Da in his own name. Meng Da then became a general on the leading side of the Wei state.
''Reaching is the most discerning, and only when he has entered the world has he been able to argue with others, and all the people are in sight.'' And the king came out, took the small dragon, held the hand, and stroked his back: "'Qing de wuwei Liu Bei assassin evil? ''Then with the same load.'' He also added Bai San to ride a regular attendant, led the new city too guard, and entrusted him with the task of southwest. At that time, the ministers may think that they are too obscene, and it is not appropriate to entrust them with their duties. The king heard that he said, "'I keep it without him, and I also shoot artemisia in the middle ear with an arrow.' ''Wei Luo'
After Cao Pi's death, Meng Da's position in the State of Wei plummeted. Sima Yi, who had initially opposed Meng Da's leadership, was in power in the State of Wei, and in addition to that, Meng Da also had a vendetta against the Wei state of Wei Xing taishou Shenyi. At that time, Zhuge Liang, the chancellor of the Shu Han Dynasty, knew that Meng Da's life in the Wei state was not good, so he wrote a letter to induce Meng Da to surrender to Shu Han. Meng Da's repeated correspondence with Zhuge Liang was exposed by Shen Yi, when Sima Yi led an army stationed in Wancheng, and without asking the imperial court, Sima Yi marched from Wancheng to cover his ears and besiege Meng Da in Shangyong.
Meng Da was besieged by Sima Yi for sixteen days, and finally betrayed by his subordinates and killed by Sima Yi. Here is a question, since Meng Da defected to the Shu kingdom, then why did Zhuge Liang not send troops to meet Meng Da during the Meng Da rebellion? It turned out that Meng Da had written a letter to Zhuge Liang to calculate a time account, and he told Zhuge Liang that Wancheng was eight hundred miles away from Luoyang and twelve hundred miles away from Shangyong. Sima Yi had to ask the emperor for instructions when he wanted to lead his troops on the expedition, so it would take a month to toss it back and forth, which was enough time to deploy Shangyong.
In the beginning, Da and Liang Shu said: "It is like going to Luo eight hundred miles, going to my twelve hundred miles, hearing my deeds, when the son of heaven on the table, than the opposite, in January, then my city is solidified, and the armies are sufficient." Then where I am in danger, Sima Gong will not come from himself; in the future, I will have no trouble. When the soldiers arrived, Da told liang again: "I have done something, and I have marched to the city in eight days, how fast!" ''Emperor Ji Xuan of Jin'
Meng Da's letter to Zhuge Liang was obviously that he did not need foreign aid, and that one month was enough time for him to do things. Meng Da's analysis is reasonable, and Zhuge Liang may also think that aid to Meng Da is not necessary. Moreover, if Zhuge Liang sent troops to aid Meng Da without authorization, it was likely that he would fight grass and snakes to make Meng Da startle into passivity.
Meng Da's letters also explicitly asked Zhuge Liang not to interfere with his actions, and the reason why he had such an attitude was actually because he had not yet made up his mind to defect to Shu Han. Sima Yi also wrote a letter to Meng Da after learning of the conspiracy between Meng Da and Zhuge Liang. The gist of this letter is that when you Meng Da betrayed Liu Bei, the people of Shu Han hated you to the bone. Doesn't the fact that the state has entrusted you with the affairs of the frontier now show the sincerity of the imperial court towards you? You must not fall for Zhuge Liang's deception, otherwise you will regret it.
Emperor (Sima Yi) feared that he would be able to send out a quick hair, and he used a metaphor for the book: "The general abandoned Liu Bei in the past, and he was in charge of the state, and the general of the state committee took the responsibility of Xinjiang and the general of the general to try to Shu, which can be described as a day in his heart. The Shu people are stupid and wise, and they can't help but cut their teeth to the general. Zhuge Liang wanted to break with each other, but there was no way out of suffering. What Mo Zhi said is not a small thing, but it is light and light and makes it revealed, which is easy to know. Dadeshu hesitates to "Emperor Ji Xuan of Jin"
Meng Da was overjoyed to receive Sima Yi's letter, believing that the imperial court now trusted him. Once Meng Da could gain security in the Wei kingdom, then he would certainly not risk defecting to Shu Han. Sima Yi's letter successfully delayed Meng Da's time to raise an army, and the reason why Meng Da failed was that he was always hesitant to defect to the Shu state, and finally found that Sima Yi's soldiers were in a hurry to move under the city. At this time, even Zhuge Liang could not save him.