How can it be seen that Lu Meng is both civil and military

An idiom "Shibei three days, when you look at each other" is Lu Meng!

The other is that Lü Meng crossed the river in white clothes and attacked Jingzhou, causing Guan Yu to defeat Maicheng (from the Romance of the Three Kingdoms).

No, Lü Meng was the general of Wu during the Three Kingdoms, that is, Wu Xia Ameng, and Lü Meng was the prime minister of the Northern Song Dynasty.

In addition, add Lu Meng, this return to Lu Meng is profile:

Lu Meng, the word Ziming, a famous general in the late Eastern Han Dynasty, a wealthy man in Runan, attached to his brother-in-law Deng Dang when he was a teenager, followed Sun Ce as a general, and was known for his courage. Lü Meng's deeds of indignation and diligence have become the representative of ancient Chinese generals who are diligent and diligent in their determination to make up for their clumsiness and dedication to mechanics, and the idioms related to it include "Shibei Three Days", "Impressive Treatment", "Wuxia Ameng" and so on.

Lv Mengzheng, the word Shenggong, a native of Luoyang, Henan, a virtuous minister of the Northern Song Dynasty, is the author of "Broken Kiln Fu" and "Destiny Fu" and other works, Lv Mengzheng was born in the Later Jin Dynasty Emperor Kaiyun for three years, and in 977 A.D. Ding Chouke champion.

What you mean is that Lü Meng may be the son of Lü Bu.

It's also possible. Calculation: Lu Bu's hometown is in Mongolia, so his son's name is Lu Meng.

Lu Bu is brave and unscrupulous, and hopes that his son will be smarter, so the words are clear.

When Lü Meng was young, Cao Cao and Liu Bei killed Lü Bu, and Lü Meng swore to avenge his father, so he followed Sun Ce to fight Jiangdong.

Later, Lü Meng killed Guan Yu, Cao Cao died of grief, Zhang Fei was assassinated for whipping his subordinates, and Liu Bei died of anger. avenged his father.

My humble opinion: From the allusion of Shibei Sanridang, Lu Meng was born as a military general, and then studied books. For example, in October of the thirteenth year of Jian'an (208), Lü Meng also followed Zhou Yu, Cheng Pu and others to break Cao Cao in Chibi, Cao Cao led the army to the north, and left Cao Ren and others to garrison Jiangling (now Jingzhou, Hubei).

Sun Quan ordered Zhou Yu and Cheng Pu to command tens of thousands of troops and hold Cao Ren across the river. When the general of Yizhou attacked Su and led the army to surrender to Cheng, Zhou Yu went to the table and asked Sun Quan to allocate the headquarters of the raid to Lü Meng for jurisdiction. Lu Meng had a different opinion.

Considering the overall situation, he believed that Zhou Yu's opinion was inappropriate. He vigorously praised the courage and talent of the raider, and said that the raider had come all the way to Mujiaohua to surrender to him, and he should only increase his troops, not deprive him of his military power. Sun Quan felt that Lü Meng was reasonable, so he returned the troops who attacked Su according to his wishes.

As a result, although Lu Meng is a military general, he knows how to manage troops and hand over people, and his strategy can be seen.