Sun Quan, as the overlord of Jiangdong, is extremely outstanding in many aspects, and here I will first talk about military and diplomatic aspects. In terms of military affairs, Sun Quan can only be said to be qualified, but in terms of diplomacy, Sun Quan is almost one of the best.

[Military aspect]

As a monarch in troubled times, Sun Quan's military ability is not bad, but it is not very good. In Sun Quan's career as a leader, siege warfare accounted for the majority, but its effect was generally average.

Regarding Sun Quan's siege warfare, the most representative is the five battles of Hefei, in history Sun Quan crusaded against Hefei five times, none of which were successful. The first time was after the Battle of Chibi, when Cao Cao was defeated on the front line, and Yangzhou Assassin Shi Wenhui had just taken over, it can be said that the external conditions were very favorable to Sun Quan, and Sun Quan also forced Hefei into a desperate situation, but later Jiang Ji exaggerated the number of Cao Wei's reinforcements, and Sun Quan was confused and failed to insist on retreating.

The second crusade against Hefei was in the twentieth year of Jian'an (215), which was very famous after the war, and the story of Zhang Liaowei's shock to Xiaoyaojin took place in this battle, when Sun Quan's army was more than ten times that of the defenders in the city, and the Wu army was more than 100,000 people, but there were only more than 7,000 soldiers in the city. As a result, he was attacked by Zhang Liao and directly into the camp, and finally had to retreat because of the plague, but Sun Quan was intercepted by Zhang Liao again because he left late, and almost died.

The last three conquests of Hefei were after Sun Quan became emperor, when Sun Quan attacked Hefei three times in just four years, Wei Zhengdong General was full of favor to contend with it, and the last time Emperor Cao Rui even personally led troops to support, Sun Quan could only return with regret under the city of Hefei.

In addition to the five expeditions to Hefei, Sun Quan also three times after the Huang Zu to eliminate it, and in the Jianghuai area twice to hinder Cao Cao, the history of Anhui City is located in the Wei and Wu front, the position is important, many times changed hands, Sun Quan once personally led the troops to attack Anhui City twice, first to pacify the rebellion of Li Shu, and then captured the Lujiang Taishou Zhu Guang. After Cao Cao observed the Jiangdong troops, he once commented: "Giving birth to a son should be like Sun Zhongmou." It can be seen that Sun Quan's military ability is recognized.

Although Sun Quan has many records of attacking the city, especially several of them obviously have an advantage, and even at least two times in the case of ten circles, which cannot be denied, but Sun Quan's general losses when leading the troops are relatively limited, and the worst one is Zhang Liao's time, when the Wu army withdrew, so Zhang Liao was given an opportunity, but the actual loss was not very large.

From the perspective of territorial scope, Sun Quan's sphere of influence gradually expanded from Jiangdong during Sun Ce's period to Jiaozhou and Jingzhou, with three states and a territory second only to Cao Wei.

On the whole, Sun Quan's military ability and Liu Bei are basically half a catty and eight taels, although he does not have Liu Bei's relatively large record of taking Yizhou and attacking Hanzhong, but he does not have as many fiascos as Liu Bei.

[Diplomacy]

In the Three Kingdoms period, including Dong Zhuo, Yuan Shao, Yuan Shu, Cao Cao, Liu Bei and other monarchs, Sun Quan's diplomatic ability is undoubtedly the most outstanding, which is indisputable, from Lian Liu to Cao, to the capture of Jingzhou, and then to the north and Cao Pi against Liu Bei, Sun Quan's excellent diplomatic ability can be seen. Of course, he often walks by the river, how can he not get his shoes wet, Sun Quan has a big heel in the matter of Gongsun Yuan in Liaodong.

After Cao Cao went south to Jingzhou, Sun Quan fought against Cao under the advice of Lu Su, and won important battles such as the Battle of Chibi and the Battle of Jiangling, and later lent Jiangling and other places to Liu Bei for a time to fight against Cao Cao.

But Liu Bei captured Yizhou and did not repay the borrowed land, the two sides almost met by force, Sun Quan then sent Lü Meng to occupy Guiyang County, Changsha County and Lingling County by force, when the two sides negotiated peace, Sun Quan took the initiative to return Lingling County to Liu Bei, as long as Liu Bei admitted his possession of Jiangxia County, Jiangxia County was occupied by Wei, Shu and Wu at that time, which was equivalent to Liu Bei exchanging half of Jiangxia County for the entire Lingling County. This move not only eased the relationship between the two sides, but also cleared the way for Sun Quan's crusade against Nanjun in the future.

In history, Guan Yu, as a general stationed in Jingzhou, is actually equivalent to the second-in-command in Liu Bei's group, Sun Quan did not hesitate to prepare to marry Guan Yu in order to win over Guan Yu, and let his son marry Guan Yu's daughter, to be honest, Liu Bei may not have married Guan Yu at that time? Sun Quan's hand is also very beautiful, if successful, it will not only further strengthen the connection between Wu and Shu, but also shake the foundation of Shu Han in a sense, and can also cover for his future capture of Jingzhou. It's a pity that Guan Yu himself didn't have a good sense of Sun Quan at that time, and Sun Quan's attitude towards asking for a daughter at that time may not be very good, but as a result, not only did this matter blow, but the relationship between the two parties deteriorated further.

When Lü Meng and others attacked Jingzhou, Guan Yu was not without precautions against Jiangdong, but under the leadership of Sun Quan, Lü Meng, Lu Xun and others incarnated as movie emperors one by one, turning Guan Yu into a daze, and even Cao Wei told Guan Yu that Sun Quan had bad intentions, and Guan Yu did not go back.

In the matter of playing with Cao Pi, Sun Quan's diplomatic performance was even more wonderful, when after the capture of Jingzhou, Guan Yu captured Yu Ban, Hao Zhou and others were also controlled by Sun Quan, Sun Quan put these people back to Luoyang, among which Hao Zhou vouched to Cao Pi that Sun Quan would surrender, and after being sent back to Jiangdong, he also said to Sun Quan that he would guarantee that the son would go to Cao Wei with the life of the whole clan, and as a result, Sun Quan has been delayed, and after the battle of Yiling, Sun Quan did not send his son as a hostage, before Cao Pi crusaded against Sun Quan, he also said that as long as Sun Quan was protage, he would immediately withdraw the army, and then Sun Quan did not reply, both sides opened. After the breakdown of relations with Shu Han, Sun Quan did not hesitate to surrender to Cao Wei in order not to be attacked from both sides to delay time, and after Yiling defeated Liu Bei, although Wei was strong, it was difficult to destroy Sun Wu, so there was no need to worry.

After the relationship with Cao Cao broke down, Sun Quan soon reunited with Shu Han, and the two sides reached an alliance again against Cao Wei, Cao Rui period, Sun Quan and Zhuge Liang repeatedly went on a northern expedition, when Cao Rui's rear was not stable, Gongsun Yuan and Kirby Neng were his rear hidden dangers, Sun Quan in order to win over Gongsun Yuan, did not hesitate to crown him as the king of Yan, but unfortunately was betrayed by Gongsun Yuan, lost his wife and lost his army, which was also Sun Quan's biggest setback in diplomacy.

Later, in order to expand his power, Sun Quan sent the general Wei Wen and Zhuge Zhi to Jiashi 10,000 in the second year of Huanglong (230), floating in the sea to seek Yizhou and Bozhou, and the Wu army reached Yizhou (that is, Taiwan Island), and in the fifth year of Chiwu (242), he sent the general Nie You and the school captain Lu Kai to sail Zhuya and Dan'er (referring to today's Hainan Island). He opened the historical prelude to exchanges between the mainland and Taiwan.

Sun Quan also further consolidated his rule over Jiaozhou, actively sending people to establish friendly relations with the countries of Funan (present-day Cambodia) and Linyi (present-day South Vietnam) outside the country, and later, he sent Jiaozhou Assassin Shi as an envoy to the Nanyang countries to establish diplomatic relations with India. In December of the sixth year of Chiwu (243), Fan Zhan, the king of Funan, also sent an envoy to offer music and things. When Fan Xun, the general of Fan Zhan, was the king of Funan, Sun Quan sent Xuanhua to engage Zhu Ying and Zhonglang Kangtai to envoy to Funan and the South China Sea countries.

But on the whole, Sun Quan's diplomatic ability is undeniable.