Cao Cao's famous men are like clouds. Those who surrendered to Cao Cao halfway are also loyal to Cao Cao and have to admire Cao Cao's strategy of employing people. Under Cao Cao, there is a general who can not only solve problems for Cao Cao at a critical moment, but also faithfully guard the border for Cao Cao. Going into battle to kill the enemy, guarding the city has a strategy. There is both autonomy and Cao Cao's trust in him. Which general cooperated with the battle so effectively? This is Cao Cao's cousin, Cao Ren. When he was young, he liked cavalry hunting and immediately became proficient in kung fu. Catch up with the era of chaos and heroes, Coss also gathered thousands of young people and began to fight in Xiangshui and Surabaya. In fact, it is a bandit. Later, Coss defected to Cao Cao, a relative of Cao Cao's family. Of course, Cao Cao used it again, so Coss followed Cao Cao to the north and south. 193, Cao Cao attacked Tao Qian in Xuzhou, and Coss was ordered to command cavalry as a pioneer. He fought against Tao Qian's general Lu You and defeated Lu You. Then, he joined forces with Cao Cao's main force and defeated Tao Qian's army again. Coss also led the cavalry to defeat Tao Qian's reserve forces. Since then, Cao Cao served as a partial teacher in the conquest of Lu Bu, that is, he coordinated Cao Cao's main attack on Xiangyang, captured Lu Bu's subordinate Liu He, and seized Xiangyang, which effectively cooperated with Cao Jun's main battle. After Cao Cao pacified the Yellow Scarf, he began to fight for his great cause. He took the emperor as a vassal and Xuchang as the capital. Because of his outstanding achievements, Coss was appointed as the secretariat of Yang Guang. But Cao Cao didn't want his brother to work in other places, and let Coss stay in Xuchang to continue to supervise the cavalry and conquer Zhang Xiu. Cao Jun returned from the conquest and was ambushed by the elite troops in Zhang Xiu, causing serious casualties. Jun's morale was low. At a critical moment, Coss led the cavalry to kill him, and his cavalry quickly turned the tide, turning the defeat into victory for Cao Jun and greatly destroying Zhang Xiu. In the battle of Guandu, Cao Cao and Yuan Shao were at loggerheads, and Cao Cao was in a weak position in military strength at that time. Coss is still fighting together at this time. Because Liu Bei temporarily obeyed Yuan Shao's command in Xu County, he harassed Cao Jun from the rear. Cao Cao could not fight Yuan Shao with peace of mind. At this time, Coss thought that Liu Bei had just commanded Yuan Shaobing, and he was sure that the command would be smooth. He asked Cao Cao to give him some troops to fight back against Liu Bei. Coss fought back. After defeating Liu Bei, he stabilized the rear for Cao Cao, led the army north again, helped Cao Cao to deal with Yuan Shao, and also defeated Yuan Shao's left-wing generals, disrupting Yuan Shao's entire strategic deployment. Yuan Shao dared not send his troops to fight again. Since then, Coss cooperated with Huang Xu, Shi Huan and others, robbed Yuan Shao's grain truck, burned down Yuan Jun's granary, and won a decisive victory in the battle of Guandu. The siege is strategic. Don't think that Coss has only coordinated operations and strategies to attack the city. In 204, when Cao Cao basically pacified the north of the Yellow River, Yuan Shao's nephew Gao Qian revolted in Changzhi, Shanxi. Cao Cao led the army to conquer and took Coss away. After Cao Cao's troops arrived at Huguan City, they began to attack the city, but the soldiers in the city were very effective and resisted Cao Jun's repeated attacks. Jun also suffered serious casualties, but he still didn't capture the lower city. Cao Cao was furious: "After the siege, kill the city!" Cao Cao's orders left the defenders with no way out, so they were even more desperate to defend the city. Cao Cao didn't attack the city for months. Coss saw the mystery, and he said to Cao Cao, "Huguan City is easy to defend but difficult to attack, with plenty of food and grass, and none of the defenders are alive." They will defend the city desperately. " Coss suggested that Cao Cao change his previous practice and withdraw the massacre order. Soon the defenders in the city really surrendered. After the war, Cao Cao appreciated Coss more and made Hou Ting his capital. Dare to kill Battle of Red Cliffs after defeat is a duel between Cao Cao and Wu Dong. Cao Jun had an absolute advantage, but he lost because he made a low-level mistake. When Cao Cao led the army to retreat, he named Cao Ren as the general of conquering the south and stayed in Jiangling to resist the Dongwu attack. This kind of work is very dangerous. Cao Cao has no absolute assurance and trust. He won't be Coss. In fact, Cao Rengan's job is to "wipe * *" Cao Cao, but it is dangerous to wipe it badly. Sure enough, Zhou Yu of Soochow led tens of thousands of troops to attack Jiangling. As soon as Zhou Yu's vanguard troops arrived, Coss took the initiative to meet the enemy. He only sent 300 people to Jinniu, and he could defeat thousands of pioneers of Zhou Yu. Jin Niu is surrounded. Coss saw danger. He personally went out of the city to fight, and quickly entered Wu Jun, where he joined forces with Jin Niu before rushing out of the encirclement. Cao Jun was besieged, and Coss returned to the army to rescue him. This time, Cao Jun not only admired Coss' bravery, but even Wu Dong's army was afraid and retreated quickly. Cao Cao also happily sealed the "Anping Pavilion Hou". Perseverance in the Battle of Guarding City Coss has been very brave since the end of Battle of Red Cliffs. Cao Cao trusted him and made him General Anxi, General Xiaoqi and General Zhengnan, guarding the border on behalf of Cao Cao. These jobs are very dangerous, and you will die if you are not careful, but Cao Ren defeated Ma Chao and beheaded Hou Yin successively, which stabilized the northern part of Cao Wei. Cao Cao officially appointed Cao Ren as the general to levy the south and defend Jingzhou. When Coss was guarding Jingzhou, Cao Jun was stationed in Fancheng, but Coss encountered a fierce battle while guarding Jingzhou. In 2 19, Guan Yu attacked Fancheng, and Cao Cao sent Yu Ban and Pound to support Ren Ying. However, due to the skyrocketing Hanshui River, Guan Yu led the Hanshui River to flood the Forbidden City and killed Pound. Coss not only didn't get foreign aid, but the flood has completely flooded Fancheng. Facing the flood in Wang Yang outside the city, Coss was desperate because he could not contact with the outside world. At this time, Coss had run out of food and grass, and the support troops sent by Cao Cao had not yet arrived. If you insist on waiting for help, it is a dead end. Coss took the lead and encouraged the soldiers to guard the city with him. Cao Jun was moved by Coss' behavior and stubbornly guarded this isolated city with Coss. Guan Yu attacked many times, but failed to capture Fancheng. It was not until Huang Xu's reinforcements arrived that Coss had hope, which led Guan Yu to retreat. Throughout his life, although he was Cao Cao's cousin, Coss was never arrogant as a relative. Moreover, in the war before Cao Cao, Cao Ren's role was actually a "firefighter". Wherever there was trouble, he went there, and every time he successfully solved the problem, which changed the situation and made Cao Cao win. Chen Shou, who wrote The History of the Three Kingdoms, commented on Cao Ren as follows: "When he was young, he didn't practice physical examination. For a long time, he was a general, strictly observing the law and discipline, and often placed his subjects around him to engage in cases." "Coss was rude when he was young and didn't pay attention to his words and deeds. After all, he is a rebellious man. However, since he became a senior military general with Cao Cao, Cao Ren changed his previous habits, strictly enforced laws and regulations, and practiced it. Cao Zhi commented on Cao Ren: "Civil and military skills are both clear, and power and wisdom are made at the time. Luxury is not excessive, frugality is not harmful to etiquette. Into the arms of the royal family, the emperor. Cao Fu is also a person who makes Hou Bo and really caresses Eastern Xia. "Coss is highly respected. Readers are welcome to criticize and correct me. 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