Lü Meng () (178 – January or February 220), courtesy name Ziming, was a Chinese military general and politician who served under the warlord Sun Quan during the late Eastern Han dynasty of China. Early in his career, he fought in several battles under the banner of Sun Ce, Sun Quan's elder brother and predecessor. Although he had been noted for his bravery, he was still deemed as nothing more than a "mere warrior" for his lack of literacy skills. Later, with encouragement from Sun Quan, Lü Meng took up scholarly pursuits to improve himself, gradually becoming a learned and competent military leader. In 217, he succeeded Lu Su as the frontline commander of Sun Quan's forces in Jing Province. Two years later, in a carefully calculated military operation, Lü Meng led an invasion of Liu Bei's territories in southern Jing Province, swiftly and stealthily capturing all the lands from Liu Bei's general Guan Yu, who was captured and executed after his defeat. Lü Meng enjoyed his finest hour after the victory but died a few months later because he was already seriously ill before the campaign.
Early life Lü Meng was from Fupo County (), Runan Commandery (), which is located southeast of present-day Funan County, Anhui. His family migrated to the south of the Yangtze River when Lü Meng was young. Lü Meng lived with his brother-in-law, Deng Dang (), who served as a military officer under Sun Ce. When he was 14 or 15, he secretly followed Deng Dang to the battles against the Shanyue tribes. Deng Dang was shocked to see his teenage brother-in-law in battle, so he scolded Lü Meng and warned him to stop. Lü Meng refused to listen so Deng Dang told Lü Meng's mother about this. When she wanted to punish him, Lü Meng said: "It is difficult to survive in poverty. If we can prove ourselves through hard work, then wealth will come eventually. How can we catch the tiger cub if we don't enter the tiger's den?" Lü Meng's mother sighed and let him have his way.(呂蒙字子明，汝南富陂人也。 ... 少南渡，依姊夫鄧當。當為孫策將，數討山越。蒙年十五六，竊隨當擊賊，當顧見大驚，呵叱不能禁止。歸以告蒙母，母恚欲罰之，蒙曰：「貧賤難可居，脫誤有功，富貴可致。且不探虎穴，安得虎子？」母哀而舍之。) Sanguozhi vol. 54.
At the time, an official scorned Lü Meng because of his young age and often insulted him by saying things like: "What can he do? His behaviour will only result in him feeding himself to the tigers." Lü Meng killed the official one day when he lost control of his anger. Initially, he took shelter under Zheng Chang () but later turned himself in to Yuan Xiong (), a colonel under Sun Ce. Yuan Xiong pleaded with his lord to spare Lü Meng's life. Sun Ce interviewed Lü Meng and was so impressed with him that he pardoned Lü Meng and appointed him as a close aide.(時當職吏以蒙年小輕之，曰：「彼豎子何能為？此欲以肉餧虎耳。」他日與蒙會，又蚩辱之。蒙大怒，引刀殺吏，出走，逃邑子鄭長家。出因校尉袁雄自首，承間為言，策召見奇之，引置左右。) Sanguozhi vol. 54.
A few years later, after Deng Dang died, Zhang Zhao recommended Lü Meng to replace Deng Dang, so Lü Meng was appointed as a Major of a Separate Command (). In the year 200, after Sun Ce was assassinated, his younger brother Sun Quan succeeded him as the warlord ruling the territories in the Jiangdong region. Sun Quan planned to reorganise his army by merging small units into larger garrisons. When Lü Meng heard about it, he collected funds to purchase elaborately designed armour for his troops. When Sun Quan came to inspect Lü Meng's unit, he was so impressed that he placed more soldiers under Lü Meng's command, thus saving Lü Meng's troops from being merged into another unit.(數歲，鄧當死，張昭薦蒙代當，拜別部司馬。權統事，料諸小將兵少而用薄者，欲并合之。蒙陰賒貰，為兵作絳衣行縢，及簡日，陳列赫然，兵人練習，權見之大恱，增其兵。) Sanguozhi vol. 54.
Lü Meng participated in Sun Quan's conquest of Danyang Commandery (丹楊郡; around present-day Xuancheng, Anhui) and made many contributions in battle. He was promoted to Commandant Who Pacifies the North () and appointed as the Chief () of Guangde County.(從討丹楊，所向有功，拜平北都尉，領廣德長。) Sanguozhi vol. 54.
Battle of Jiangxia
In the spring of 208, Lü Meng was assigned to be the navy commandant when Sun Quan launched a campaign against Huang Zu, the Administrator () of Jiangxia Commandery (present-day eastern Hubei). During the battle, Ling Tong and Dong Xi destroyed Huang Zu's two large mengchongs while Lü Meng's unit defeated Huang Zu's navy. Lü Meng killed Huang Zu's subordinate Chen Jiu () in the midst of battle. Huang Zu attempted to flee after learning of Chen Jiu's death, but was captured by Sun Quan's soldiers. After the battle, Sun Quan deemed Lü Meng's contributions to be the most significant because Chen Jiu's death secured their victory. Lü Meng was promoted to General of the Household Who Sweeps Across the Wilderness () and awarded 10 million coins.(從征黃祖，祖令都督陳就逆以水軍出戰。蒙勒前鋒，親梟就首，將士乘勝，進攻其城。祖聞就死，委城走，兵追禽之。權曰：「事之克，由陳就先獲也。」以蒙為橫野中郎將，賜錢千萬。) Sanguozhi vol. 54.
Red Cliffs campaign
In the winter of 208, Lü Meng participated in the Battle of Red Cliffs, in which the allied forces of Sun Quan and Liu Bei defeated the forces of the northern warlord Cao Cao at Wulin (烏林; in present-day Honghu, Hubei). Cao Cao perfunctorily retreated to northern China, leaving behind his general Cao Ren to defend Nan Commandery (南郡; around present-day Jingzhou, Hubei). Sun Quan's forces, led by Zhou Yu and Cheng Pu, pressed on their attack and besieged Cao Ren in Nan Commandery.(是歲，又與周瑜、程普等西破曹公於烏林，圍曹仁於南郡。) Sanguozhi vol. 54.
Around the time, Xi Su (), a military officer from Yi Province (covering present-day Sichuan and Chongqing), brought along his men to defect to Sun Quan's side. Zhou Yu proposed to Sun Quan to let Lü Meng take charge of Xi Su's troops. However, Lü Meng praised Xi Su as a courageous person and declined to take over command of Xi Su's men. He believed it was disrespectful to do so because Xi Su had come a long way to join them. Sun Quan agreed with Lü Meng and returned Xi Su's troops to him.(益州將襲肅舉軍來附，瑜表以肅兵益蒙，蒙盛稱肅有膽用，且慕化遠來，於義宜益不宜奪也。權善其言，還肅兵。) Sanguozhi vol. 54.
During the siege of Nan Commandery, Zhou Yu ordered Gan Ning to lead a detachment to take control of Yiling (夷陵; present-day Yichang, Hubei), but Gan Ning came under attack by a separate enemy force led by Cao Ren's subordinates. When Gan Ning sent a messenger to Zhou Yu's camp to request for relief forces, most of Sun Quan's officers saw that they did not have enough men to spare, so they refused to help Gan Ning. Lü Meng, however, insisted on saving Gan Ning. He told Zhou Yu and Cheng Pu: "I suggest we leave Ling Tong behind while I follow you to help Gan Ning. It is imperative that we lift the siege (on Gan Ning) because he may not be able to hold out for long. I assure you that Ling Tong can defend our current position for at least ten days."
Lü Meng also suggested to Zhou Yu to send 300 men to block the enemy's retreat route with huge logs. When the reinforcements arrived at Yiling, they killed over half of the total number of enemy troops and forced the surviving ones to retreat at night. However, the enemy encountered the huge logs and were unable to cross over on horseback, so they had to dismount and proceed on foot. Sun Quan's pursuing forces arrived at the blockade and seized about 300 horses left behind by the enemy, which they transported back to their camp on boats. The morale of Zhou Yu's army improved greatly, so they crossed the Yangtze River, set up a garrison near the enemy base, and then engaged Cao Ren's forces in battle. Cao Ren lost the battle and eventually ordered his troops to abandon their position and retreat. Sun Quan's forces captured Nan Commandery and gained control over central Jing Province (covering present-day Hubei and Hunan). Upon his return, Lü Meng was promoted to Lieutenant-General () and appointed as the Prefect () of Xunyang County (尋陽縣; southwest of present-day Huangmei County, Hubei).(瑜使甘寧前據夷陵，曹仁分衆攻寧，寧困急，使使請救。諸將以兵少不足分，蒙謂瑜、普曰：「留淩公績，蒙與君行，解圍釋急，勢亦不乆，蒙保公績能十日守也。」又說瑜分遣三百人柴斷險道，賊走可得其馬。瑜從之。軍到夷陵，即日交戰，所殺過半。敵夜遁去，行遇柴道，騎皆舍馬步走。兵追蹙擊，獲馬三百匹，方船載還。於是將士形勢自倍，乃渡江立屯，與相攻擊，曹仁退走，遂據南郡，撫定荊州。還，拜偏將軍，領尋陽令。) Sanguozhi vol. 54.
Scholarly pursuits The Jiang Biao Zhuan () recorded that Sun Quan once told Lü Meng and Jiang Qin: "Both of you are commanders now so you should enrich yourself with knowledge." Lü Meng replied: "I have many things to attend to in the army, so I am afraid I won't have time to read." Sun Quan then said:(江表傳曰：初，權謂蒙及蔣欽曰：「卿今並當塗掌事，宜學問以自開益。」蒙曰：「在軍中常苦多務，恐不容復讀書。」權曰： ...) Jiang Biao Zhuan annotation in Sanguozhi vol. 54. Lü Meng was so inspired by Sun Quan's words that he began to study diligently and acquire more knowledge. He eventually surpassed some Confucian scholars in terms of the number of texts he read.(蒙始就學，篤志不倦，其所覽見，舊儒不勝。) Jiang Biao Zhuan annotation in Sanguozhi vol. 54.
Meeting with Lu Su In 210, after Lu Su succeeded Zhou Yu (who died of illness earlier that year) as the frontline commander of Sun Quan's forces, he passed by Lü Meng's garrison on his way to Lukou (陸口; at Lushui Lake near present-day Chibi, Hubei). Lu Su had all along regarded Lü Meng with contempt, but someone told him: "General Lü's fame and glory are increasing day by day. You shouldn't view him in the same light now as you did in the past. You should visit him soon." Lu Su then headed to Lü Meng's camp. After some drinks, Lü Meng asked Lu Su, "You have received an important appointment and you are going to be stationed near Guan Yu. Have you made any contingency plans to deal with unforeseen circumstances?" Lu Su lackadaisically replied, "I will adapt to the situation when the time comes." Lü Meng then said: "The east and the west may be one family now, but Guan Yu is a person with the might of bears and tigers. How can you not make preparations beforehand?" Lü Meng then proposed five strategies to Lu Su on how to deal with Guan Yu. Lu Su left his seat, came closer to Lü Meng, placed his hand on his shoulder and said, "Lü Ziming, I never knew you had such insights until I came here." He also visited Lü Meng's mother and became friends with Lü Meng.(魯肅代周瑜，當之陸口，過蒙屯下。肅意尚輕蒙，或說肅曰：「呂將軍功名日顯，不可以故意待也，君宜顧之。」遂往詣蒙。酒酣，蒙問肅曰：「君受重任，與關羽為鄰，將何計略，以備不虞？」肅造次應曰：「臨時施宜。」蒙曰：「今東西雖為一家，而關羽實熊虎也，計安可不豫定？」因為肅畫五策。肅於是越席就之，拊其背曰：「呂子明，吾不知卿才略所及乃至於此也。」遂拜蒙母，結友而別。) Sanguozhi vol. 54.
Jiang Biao Zhuan account The Jiang Biao Zhuan recorded a slightly different account of the meeting between Lu Su and Lü Meng. Lu Su placed his hand on Lü Meng's shoulder and said: "I heard you were previously a mere warrior. But now, you have taken up scholarly pursuits and you are no longer that Meng under Wu." Lü Meng replied:(後魯肅上代周瑜，過蒙言議，常欲受屈。肅拊蒙背曰：「吾謂大弟但有武略耳，至於今者，學識英博，非復吳下阿蒙。」) Jiang Biao Zhuan annotation in Sanguozhi vol. 54. He then presented three strategies to Lu Su on how to counter Guan Yu. Lu Su respected Lü Meng so he kept the strategies to himself and did not reveal them.(密為肅陳三策，肅敬受之，祕而不宣。) Jiang Biao Zhuan annotation in Sanguozhi vol. 54.
The Chinese idioms "Ah Meng from Wu" () and "rub one's eyes and look" () originated from this conversation. The former is used to describe an unlearned person who achieves improvement through diligent study while the latter means to see a person in a different light, especially after the person has made remarkable improvement.
Battles of Wan County and Ruxu
Cao Cao appointed Xie Qi () as the Agricultural Officer () of Qichun County and ordered him to station at Wan County (皖縣; present-day Qianshan County, Anhui) to harass the border of Sun Quan's domain. Lü Meng tried to induce Xie Qi into surrendering but failed, so he attacked Xie Qi. Xie Qi lost the battle and retreated. His subordinates, Sun Zicai () and Song Hao (), brought along several civilians and surrendered to Lü Meng.(魏使廬江謝奇為蘄春典農，屯皖田鄉，數為邊寇。蒙使人誘之，不從，則伺隙襲擊，奇遂縮退，其部伍孫子才、宋豪等，皆攜負老弱，詣蒙降。) Sanguozhi vol. 54.