After Liu Bei became the pastor of Xuzhou, he fought with Yuan Shu in the southeast of Xuzhou, and just when the two sides were fighting inextricably, liu Bei's rear was in trouble, and Cao Bao, the next Pi Xiang, was killed by Zhang Fei, because Cao Bao was reversed. As a result, Lü Bu just came to attack Picheng, and in a battle, he went down to Picheng and captured Liu Bei's wife, children, and children. Liu Bei, who had lost his rear, was defeated by Yuan Shu and had to retreat, and finally, in the absence of soldiers and food, and internal and external difficulties, he had to surrender to Lü Bu in order to find a place to live.
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Above we mentioned that due to Cao Bao's rebellion, Liu Bei's base camp was taken by Lü Bu. It can be said that the reason for Liu Bei's failure was because of Cao Bao's rebellion. So who is Cao Leopard in this? Why betray Liu Bei at a critical moment? Speaking of Cao Bao, Cao Bao turned out to be Tao Qian's subordinate. This Cao surname in Xuzhou is a family family, Tao Qian this person likes to be noble and poor, looks down on the people of the cold door, according to the "Romance of the Three Kingdoms - Tao Qian Biography" record tao qian backsliding renqing, Cao Hong, etc., slandering the villain, humble and personal Renzhi. The criminal government is discordant, and the good is often harmed by it, and it is gradually chaotic. It can be seen that this Cao Bao is not a good person, but he is deeply trusted by Tao Qian, so he can be said to be the first general in Xuzhou, and his usual style can be imagined.
Speaking of this, it is necessary to say why Cao Bao rebelled against Liu Bei. According to the "Hero's Record", because Zhang Fei and Cao Bao were at odds, Zhang Fei sent people to surround Cao Bao's camp and want to kill Cao Bao. This is the reason why Cao Bao is anti-.
If according to the Hero's Record, it was Zhang Fei who forced Cao Bao to rebel. But this statement is very problematic. We know that at that time, Yuan Shu was attacking Xuzhou, and Liu Bei led his troops to fight on the front line, letting Zhang Fei guard the base camp of Pi. So, zhang fei, as the main general who stayed behind, was he a big fool who didn't know the priorities? Obviously not, although Zhang Fei was reckless, he still knew the weight of the matter. Therefore, even if Zhang Fei and Cao Bao have a big contradiction, they will not kill Cao Bao at this juncture and force Cao Bao to rebel.
Since Zhang Fei would not force Cao Bao to rebel, it must be Cao Bao himself who rebelled. There's a reason to say this. In the Book of Heroes, it is recorded that the army went east to the west of Xia Pi. Beizhong Lang sent Sima Zhangyu (司馬章诳) to Yibu at night, saying, "Zhang Yide and Xia Pi Xiang Cao Leopard fought together, Yide killed the leopard, and there was chaos in the city, and he did not believe it." Danyang soldiers have a thousand people tun west baicheng north, General Wen came to the east, the size of the enthusiastic, such as resurrection. The general marched to the west gate of the city, and the Danyang army opened the door to the general." Look, not long after Zhang Fei killed Cao Bao, the army led by Lü Bu was less than forty miles away from Xia Pi. Is it a coincidence? Definitely not.
Lü Bu and Cao Bao must have colluded, otherwise Cao Bao's subordinate Danyang soldiers would not have known that Lü Bu was coming, and it was the night that Cao Bao was killed. Not to mention sending someone to tell Lü Bu that Cao Bao was killed by Zhang Fei, that Danyang soldiers were guarding the west gate of the city, and that Lü Bu would open the door as soon as he arrived. Obviously, Cao Bao had made an appointment with Lü Bu and done Lü Bu's internal response.
The reason why Cao Bao was surrounded and killed by Zhang Fei must be that Zhang Fei already knew that Cao Bao colluded with Lü Bu to prepare to plot to take Xia Pi, so with the idea of attacking first, he wanted to get rid of Cao Bao first, and then defend Xia Pi. Zhang Fei probably did not expect that he would not be able to control the situation, causing chaos in the city, and finally Lü Bu, with the help of Danyang soldiers, captured Xia Pi City.
In addition, according to the records in the Book of Later Han and the Book of Heroes, Yuan Shu wrote a letter to Lü Bu at that time, promising to give Lü Bu 200,000 yuan of military food, on the condition that Lü Bu attack Liu Bei. Coupled with the fact that Cao Bao was also the father of Lü Bu's second wife, the two sides confirmed that Cao Bao was more likely to collude with Lü Bu to take down Pi. Therefore, Cao Bao's own rebellion against Liu Bei was the most likely. But this is only a speculation based on historical records, after all, there are too few accounts of Cao Bao in history, and the description of this event is only sporadically recorded in the "Hero's Record" and "Book of later Han". Exactly what the reason is, perhaps in the absence of conclusive historical facts, can only be guessed.