Liu Bei and Cao Cao fought in the Great Battle of Hanzhong, Huang Zhong beheaded Xiahou Yuan and captured Dingjun Mountain, Zhuge Liang asked Zhao Yun, Guan Xing, and others to make suspicious troops plan to scare away Cao Jun, Cao Cao night patrol the military camp, found Xiahou Huan's soldiers packing up their things and preparing to retreat, so in the name of rebellion, killed Yang Xiu. Cao Cao was shot by Wei Yan again, and hurriedly retreated back to Xudu. Liu Bei won a great victory and occupied Hanzhong.
After Liu Bei took Dingjun Mountain, he originally wanted to cross the Han River to attack Zhang Guo and Guo Huai, but seeing that the two were already on the defensive, he gave up his plan to cross the river. After Cao Cao arrived at Yangping Pass, he began a confrontation with Liu Bei. Cao Cao used grain and grass as bait to lure Huang Zhong and Zhao Yun to rob the grain, Huang Zhongzhong was trapped, and Zhao Yun single-handedly rescued Huang Zhong and his subordinate Zhang Zhu. Cao Cao led his army to chase after him, Zhao Yun returned to the camp and had already emptied the camp to show Cao Cao, and ambushed the crossbowmen, Cao Cao was suspicious and did not dare to come forward, and when he retreated, he was trampled by Zhao Yun's counterattack Cao army, killing and wounding them, zhao Yun was praised by Liu Bei and Zhuge Liang for "being bold".
From the twentieth year of Jian'an (215 AD) in the battle with Cao Cao in the battle of Hefei, Sun Quan did not earn any cheap, and the afterglow of Xiaoyaojin did not go away for a long time. However, Cao Cao still kept tossing and turning, and Sun Quan felt that he could no longer fight with Cao Cao. In the spring of the twenty-second year of Jian'an (217 AD), Cao Cao marched south to Huainan and reached Juchao. In February, at the Battle of Fusukou, Sun Quan's general Gan Ning defeated the Cao army with little success. However, Lü Meng repeatedly reminded Sun Quan that Guan Yu should be guarded against in the north, and Liu Bei's strong development momentum was far more threatening to Eastern Wu than Cao Cao. Especially after Liu Bei occupied Yizhou, Jingzhou became the eastern gate of shu Han, and could go down the river at any time, invading The Yangtze River defense line of Eastern Wu. You can't just focus on the direction of Hefei.
In 219, Sun Quan took the initiative to request Cao Cao to attack Guan Yu, who was attacking Fancheng. He also sent Lü Meng and others to directly collect Liu Bei's public security of Jiangling, Nan County, to exchange Jingzhou for Yizhou. Forcing Guan Yu to retreat under the heavy blows of Xu Huang's army, he held out without any basis, the whole army had no grain and grass inside, and was abandoned by Liu Bei outside, and under the joint attack of Cao Cao and Sun Quan, the whole army persisted for more than half a year and scattered in Maicheng overnight, and Guan Yu and Zi Guanping were killed by Sun Quan's pawn Ma Zhong. Cao Cao received a head from Sun Quan in Luoyang. Also in the contradiction of whether to be an emperor, he could not eat well and could not sleep, had a terrible headache, and soon died in a nightmare.