In the first year of Huang Wu (AD 222), Liu Bei led an army to attack the western border. Sun Quan appointed Lu Xun as viceroy and governor, and led 50,000 people including Zhu Ran, Pan Zhang, Han Dang, Xu Sheng, Xian and others to resist. Liu Bei set up dozens of camps from Wuxia and Jianping Lian to Yiling County, lured barbarians in this area with money, brocade, titles and various rewards, and appointed general Feng as the main commander, as the pioneer, and assisted Kuang, Liao Chun and Fu Rong. He first sent Wu Ban to lead thousands of people to camp on the flat ground, hoping to provoke Wu Jun into battle. The generals advocated attacking it, and Lu Xun said, "There must be fraud. Let's see. " Knowing that his plan wouldn't work, Liu Bei walked out of the valley with 8,000 ambushes. Lu Xun said: "The reason why I won't let you attack Wu Ban is because I guess there must be fraud." Lu Xun's Shangshu said: "Yiling is an important place and a critical moment for the country. Although it is easy to get, it is also easy to lose. Once lost, not only a county is lost, but the whole Jingzhou is worth worrying about. Since we are fighting for this position, we must ensure success. Liu Bei didn't listen to fate, didn't keep his lair, but he dared to die. I really have no talent, but relying on your great strength, I have just defeated the enemy. Looking back at Liu Bei's use of troops before and after, it is not worrying to infer that many defeats win less. At first, I was worried that he would go hand in hand with land and water, but now I have given up the water army and only used foot soldiers to camp everywhere. Judging from his arrangement, there must be no other changes. I hope you can sit back and relax and don't worry about it. " The generals said, "At the beginning, we attacked Liu Beiying, but now we let him go five or six hundred miles deep. The two sides were deadlocked for seven or eight months. He is firmly guarded at every key point. Attacking him now will definitely be bad for our army. " Lu Xun said: "Liu Bei is a cunning enemy and has experienced many things." When his army was just assembled, it was not offensive to be considerate. Now we have been stationed for a long time and have not benefited from it. The soldiers were tired, depressed and helpless. It is today. " So I attacked the barracks first, but I didn't win. All the generals said, "Death is a waste of soldiers." Lu Xun said: "I have mastered the method of breaking them." He ordered his soldiers to each take a thatch and set the Shu camp on fire. When this form was formed, they led all the troops to attack and behead King Hu of Feng and Sha at the same time, and attacked more than forty camps of Shu army. Liu Bei's troops drew and Liu Ning were cornered and demanded to surrender. Liu Bei boarded Ma 'anshan and was surrounded by troops. Lu Xun urged the army to attack on all sides, and the Shu army was divided, killing and injuring tens of thousands. Liu Bei fled at night, and the people in the post station took the stirrup and armor left by the defeated soldiers to the pass and burned them, which blocked Wu's pursuers and Liu Bei was able to escape into the city. The ships and equipment of the Shu army, the water and munitions of the infantry were all gone at once, and the ruins drifted down and filled the river. Liu Bei was very ashamed and resentful and said, "Isn't it an act of god that I was insulted by Lu Xun?"

At first, Sun Huan went to an island to crusade against Liu Bei's striker. He was surrounded by Liu Bei's army and asked Lu Xun for help. Lu Xun said, "We can't save him yet." The generals said, "Sun Andong is a relative of Sun Quan. Knowing that he is besieged, how can he not go to the rescue? " Lu Xun said: "Anton is deeply loved by soldiers. The city is strong and there is plenty of food and grass. Don't worry. When my plan is implemented, even if I don't save him, he will naturally save him. " When the strategy was fully implemented, Liu Bei's troops fled and scattered. Later, Sun Huan met Lu Xun and said, "I really complain that you didn't come to the rescue. Until today, I didn't know that your schedule is very good! "

In resisting Liu Bei-shi, some generals were old generals in Sun Ce and some were relatives of the country, each with its own advantages, and they were conceited and did not obey Lu Xun's command. Lu Xun put his hand on the hilt and said, "Liu Bei is a world-famous figure. Even Cao Cao is afraid of him. Now he has invaded our border. This is a strong opponent. You all owe your country and should live in harmony. * * * You should not obey orders to destroy this enemy to repay your kindness and heavy responsibility. Although I am a scholar, I am ordered by the Lord. The reason why the Lord wronged you and let you listen to my command is because I still have a little strength and can bear the burden of humiliation. Everyone has his own responsibility, how can he refuse! Military orders have rules and cannot be violated. " Until Liu Bei was defeated, most of the tricks came from Lu Xun, which made people believe. Hearing this, Sun Quan said, "Why didn't you report to me when the general didn't listen to orders?" Lu Xun replied: "I feel deeply indebted, and my responsibility exceeds my ability." Besides, some of these generals can be confidants, some can be war generals, and some are ministers in active service. They are all people who should make a great career with them. Although I am a coward, I admire Lin Xiangru and Kou Xun's humility and forbearance to others in private, in order to complete the great affairs of the country. " Sun Quan laughed, praised him for doing the right thing, added him as the assistant general and Jingzhou shepherd, and changed him to Jiangling Hou on the spot.

In addition, after Liu Bei lived in Baidicheng, there were Xu Sheng, Pan Zhang, etc. Everyone contended that they could capture Liu Bei alive and requested to attack again. Sun Quan asked Lu Xun about it. Lu Xun, Zhu Ran and Luo Tong thought that Cao Pi mobilized a large number of troops to help Wu Pingding and Liu Bei by appearances. In fact, they had ulterior motives and decided to return to the army immediately. Soon, Wei Jun went out and Wu was attacked on three sides.