In the fifth year of Jian'an (200), Liu Bei was defeated by the powerful Cao Cao, and he left his two young and beautiful wives, Gan and Mi, to Guan Yu, who was stationed in Xia Pi, and fled alone and frantically, all the way to Yuan Shao in Hebei. In the rendition, Cao Cao, in order to capture Guan Yu, used a trick to lure Guan Yu out and besieged him on Tushan Mountain, while on the other side captured Xia PiCheng and captured Liu Bei's two wives, Gan and Mi. Zhang Liao, alone, ascended Tushan Mountain, "agreed on three things" with Guan Yu, and successfully persuaded Guan Yu to surrender.
After Guan Yu submitted to Cao Cao, he really thought about Cao Cao and made a lot of meritorious contributions to him. For example, in the Battle of Baimapo, Guan Yu killed Yan Liang, who was helpless, and in the Battle of Yanjin, he once again attacked, and triaded to kill another Tingzhu Wen ugly with Yan Liang's name. In these two shots, Guan Yu eliminated the two major generals under Yuan Shao, causing them heavy losses.
At this time, even Zhang Fei, who had his head on the ground with Guan Yu, thought that the second brother had defected and completely sided with the Han thief Cao Cao. In fact, Guan Yu was only repaying the favor, and after he made a contribution to Cao Cao, he escorted the two sisters-in-law through the five levels and six generals, and went to find his eldest brother Liu Bei.
If Guan Yu really surrendered to Cao Cao, could he make up his mind to take a shot at his former eldest brother and third brother? Personally, I believe that Guan Yu would not kill Liu Bei and Zhang Fei, and according to the relevant content in the interpretation, the analysis is as follows.
First of all, Guan Yu was a man of great affection and righteousness, and even if he truly surrendered to Cao Cao, he would not kill his good brothers Liu Bei and Zhang Fei.
One day in 184 AD, Guan Yu, Liu Bei, and Zhang Fei met at the hotel and talked happily. The three of them agreed to go to Zhang Fei's Taoyuan the next day to worship as brothers with different surnames. The next day, the three of them "prepared the black cow and white horse sacrifice and other items in the peach orchard", burned incense and prostrated their heads, and met:
"I do not want to be born on the same day of the same month of the same year, but only to die on the same day of the same month of the same year." Emperor Tianhou Earth, true to this heart, ungrateful, heaven and man fighting together! ”
Ancient people believed in oaths and ghosts, believing that the oaths they had made had been remembered by the gods, and if they were not obeyed, they would be punished. Therefore, the ancient people, who easily did not promise, if they had a vow, would certainly keep it. Guan Yu was a rare great hero at that time, "heavy on love and righteousness", was the "righteous absolute" among the Three Kingdoms, and would not betray Liu Bei and get a gun from his brother Zhang Fei. The three of them slammed their heads on the ground, it was a lifelong friendship, even if Guan Yu and Liu Bei and Zhang Fei parted ways and sincerely surrendered to Cao Cao, they would not be embarrassed for their former brothers.
Secondly, in order to show the image of "not forgetting the old lord" in front of Cao Cao, Guan Yu would not attack Liu Bei and Zhang Fei.
Why did Cao Cao love Guan Yu so much, didn't he value his character? If Guan Yu betrays his faith and forgets his brother for money, beauty, and title (Marquis of Hanshouting), he forgets his brother and betrays his brother. Cao Cao did not attach so much importance to Guan Yu, believing that Guan Yu was also a man who betrayed the lord and sought glory, and like other generals, he was greedy and afraid of death, and he could also betray his lord.
Then, if such Guan Yu surrenders to himself, he may also turn his back on himself, and even more, give himself a knife behind his back, and he will not know how to die. Therefore, in order to maintain his image of "heavy love and righteousness", Guan Yu would not attack his eldest brother Liu Bei and third brother Zhang Fei.
In the end, even if Guan Yu wanted to kill his eldest brother Liu Bei and third brother Zhang Fei, he was not necessarily Zhang Fei's opponent.
Even if Guan Yu wanted to kill Liu Bei and Zhang Fei, he might not be able to kill him. In the rendition, outside the ancient city, Guan Yu and Zhang Fei have a dragon fight. Although Guan Yu was not guarding against Zhang Fei, he was almost beheaded by Zhang Fei. In this contest, Guan Yu always fell behind and was beaten by Zhang Fei. If it were not for Cai Yang's thousands of miles of pursuit and killing, giving Guan Yu a "head", Guan Yu and Zhang Fei would fight down and divinate.
If You add Liu Bei, then Guan Yu is even less an opponent of Liu Bei and Zhang Fei. Guan Yu once personally admitted that he was inferior to his third brother Zhang Fei. Guan Yu relieved Cao Cao's siege of the white horse and killed Yan Liang in a second, and Cao Cao praised him. Guan YuDao:
"What a foot! My brother Zhang Yide took the head of a general in a million troops, such as probing the sac to take the ear. ”
It can be seen that although Guan Yu is full of pride, he is angry with the third brother Zhang Fei, believing that the third brother will take the enemy's first rank like probing the bag to take things, and he is ashamed of himself. Cao Cao also solemnly wrote down Zhang Fei's name on his clothes and warned his generals to be careful when encountered in the future.
Summary: According to common sense, even if Guan Yu truly submitted to Cao Cao, he would not have killed his former brothers Liu Bei and Zhang Fei. He will remember the old love and let it go. For example, Xu Shu, who assisted Liu Bei for a short time, came to Cao Ying and did not say a word, "I am in Cao Ying's heart in Han." Even if Guan Yu really didn't recognize his six relatives and wanted to kill Liu Bei and Zhang Fei, he wasn't necessarily Zhang Fei's opponent, and that was the point.