In the Romance of the Three Kingdoms, Cao Bao is a special character, he is Tao Qian's general, and later Xuzhou was acquired by Liu Bei, and Cao Bao was a general under Liu Bei. Although this person was not as brave as Guan Yu Zhang Fei, he commanded xuzhou's army. Also because of this person, Xuzhou was taken by Lü Bu. So Cao Bao seems to have some relationship with Lü Bu.
In the novel, Cao Bao is Lü Bu's son-in-law. The history does not say that Cao Bao does not seem to have much to do with Lü Bu, but Cao Bao is a local figure in Xuzhou, the surname Cao is a local surname, Tao Qian used to pay more attention to the rich and noble families, such as Cao Bao, for the Han forces are not very important, Xuzhou has many capable generals, Tao Qian is not very important.
Cao Bao was very powerful, especially the Danyang soldiers under him, who had always been valued. However, the historical Cao Leopard was not Lü Bu's Yue Fei, and the two men were incompatible, and there was no reason to become Weng's son-in-law. The story goes like this. Yuan Shu raised an army to recruit Liu Bei, and fought with Liu Bei in the xuyi and Huaiyin areas, and did not win or lose for more than a month. Zhang Fei, who was sent by Liu Bei to take over Xia Pi and Danyang Bing, was rejected by Cao Bao, the chancellor of Xia Pi. So the two men began to attack each other, and finally forced Cao Bao to decide to rebel against Lü Bu.
At the same time, Yuan Shu secretly married Lü Bu and promised 200,000 grain and grass, hoping to help him attack Liu Bei's rear. So Lü Bu led his troops to attack Xia Pi. When he was still forty miles away from Xia Pi, he was meeting Xu Tan, another leader of the Danyang soldiers in Xia Pi City, and Sima Zhangchen, who had been sent to surrender to Lü Bu. Zhang Yi said to Lü Bu, "Zhang Yide and Xia Pi Xiang Cao Leopard fought together, Yide killed the leopard, there was chaos in the city, and (mutual) did not believe it." Danyang bing has a thousand people tun west of the white gate city, General Wen came to the east, the size is enthusiastic, such as resurrection. The general marched to the west gate of the city, and the Danyang army opened the door to the general"As a result, Lü Bu took Xia Pi very smoothly, and defeated Zhang Fei, capturing Liu Bei's wife and military supplies, as well as the family members of the Military Officials.
Cao Bao was originally a former general of Tao Qian, and was used as the Lower Pi Xiang. In the early days when Liu Bei was attached to Tao Qian, Tao Qian gave Liu Bei 4,000 Danyang soldiers. These soldiers were initially led by Cao Bao, and in the second war against Xuzhou launched by Cao Cao to avenge his father, he stationed with Liu Bei in Tandong to defend against Cao Cao. However, due to unfavorable combat, he was defeated by Cao Cao.
In any case, Cao Bao and Zhang Fei had a contradiction, thinking that if they hugged Lü Bu's thigh, they could be a blessing in disguise, but later they did not expect to die at Zhang Fei's hands, which was the end of the tiger. ("Heroes": Beizhong Lang sent Danyang Xu to Sima Zhangyu at night, saying, "Zhang Yide and Xia Pi Xiang Cao Leopard fight together, Yide kills leopards, the city is in chaos, and does not believe.") Danyang bing has a thousand people tun west of the white gate city, General Wen came to the east, the size is enthusiastic, such as resurrection. The general's soldiers went to the west gate of the city, and the Danyang army opened the door to the general." Cloth entered at night and went down to the city in the morning. At dawn, Dan Yangbing opened the door and deployed soldiers. Bu Yu sat on the door, set fire on foot and horse, broke the Yide soldiers, and obtained his wife's military supplies and the family mouth of the generals. "Hero's Record": Zhang Fei was left to guard Xia Pi, and led the army to fight with Yuan Shu at the Huaiyin Stone Pavilion, and there was more victory and defeat. Tao Qian sent Cao Bao to Xia Pi, and Zhang Fei wanted to kill him. The leopards camped themselves and made people recruit Lü Bu. Bu removed Pi, and Zhang Fei was defeated and left. ）