After the changes in Jingzhou, it was also concerned by Sun Quan's group, and at the suggestion of Lu Su, Sun Quan sent him to Jingzhou, wanting to unite everyone to fight against Cao Cao.

【Lu Su from the East】

After Liu Biao's death, the situation in Jingzhou changed, and Lu Su persuaded Sun Quan: "The land of Jingchu is adjacent to our Wu country, and it can reach the north along the river, connecting the river and Han Dynasty outside, and separated by mountains and mausoleums inside. Now that Liu Biao has just died, the two sons have never been at odds, and the generals in the army have been divided into two factions. In addition, Liu Bei is a hero in the world, and there are contradictions with Cao Cao, and he lives with Liu Biao, who is jealous of his talent and does not dare to reuse it. If Liu Bei and Liu Biao's sons work together and work together, we should appease them and make allies with them; If they are separated from each other, we should make another plan to accomplish our own great things. I asked to be ordered to go to Jingzhou to pay condolences to Liu Biao's sons, and to comfort the generals in their army, and to persuade Liu Bei to appease Liu Biao's subordinates and work together against Cao Cao, and Liu Bei must be happy to obey. If this matter is handled well, then the world can be calmed. If you don't go to Jingzhou now, I'm afraid Cao Cao will be in front. Sun Quan immediately agreed to send Lu Su there.

Jingzhou was one of the targets of Sun Quan's Jiangdong group for a long time, so after Liu Biao's death, Lu Su immediately persuaded Sun Quan to send himself out to understand the internal situation in Jingzhou. For Sun Quan, if there is an opportunity in Jingzhou, of course, it cannot be missed. However, at that time, there was a behemoth of Cao Cao in the north, relatively speaking, Cao Cao took the opportunity to seize Jingzhou, and Cao Cao's strength was much stronger than Sun Quan, so it was not good for Sun Quan to fight for Jingzhou with Cao Cao, and as Jingzhou was upstream in Jiangdong, and Jiangdong shared the Yangtze River natural risk, so in the eyes of Lu Su, Sun Quan and others, even if they could not get Jingzhou, they could not let Cao Cao get it, so they could even put aside their previous grudges and form an alliance with Jingzhou.

Among them, Lu Su emphasized that Liu Bei should be wooed, because at that time, Liu Bei was not only one of the recognized heroes in the world at that time, but also a staunch anti-Cao Cao faction, so Lu Su thought that Liu Bei was indispensable if he wanted to unite Jingzhou against Cao Cao.

However, the plan could not catch up with the change, and Lu Su had just arrived at Xiakou when he heard that Cao Cao had gone to Jingzhou to march. When Lu Su rushed to Nanjun day and night, Liu Biao's son Liu Cong had already surrendered to Cao Cao, and Liu Bei was panicking and preparing to cross the Yangtze River south.

Lu Su then went directly to meet Liu Bei, went to Dangyang Changhanpo, met with Liu Bei, and relayed Sun Quan's intentions to Liu Bei in detail, and stated the strength and consolidation of Jiangdong, and persuaded Liu Bei to cooperate with Sun Quan to resist Cao. Liu Bei was very happy. At this time, Zhuge Liang was following Liu Bei, and Lu Su said to Zhuge Liang, "I am your brother's friend", and the two immediately formed a friendship. Liu Bei then went to Xiakou and sent Zhuge Liang to envoy Dongwu to meet Sun Quan, and Lu Su also returned to restore his life.

This incident is also recorded in the "Jiangbiao Biography":

At that time, Sun Quan sent Lu Su to mourn Liu Biao and comfort his two sons, and also asked Lu Su and Liu Bei to unite. But Lu Su had not yet arrived, and Cao Cao had already crossed Hanjin. Lu Su then continued to move forward and met Liu Bei in Dangyang. He conveyed Sun Quan's intentions, discussed the world's major events and the current situation with Liu Bei, and expressed his courtesy. And asked Liu Bei, "Where are you going now?" ”

Liu Bei said: "I have an old relationship with Cangwu Taishou Wu Ju (also known as Wu Chen) and want to go to him." ”

Lu Su said: "General Sun is wise and benevolent, respectful and courteous to capable people, and the heroes and heroes of Jiangnan are all attached to him, and now he has occupied six counties such as Huiji, with excellent weapons and sufficient grain and grass, which is enough to establish a business." Now I plan for you, it is better to send an envoy to form an alliance with Jiangdong, and everyone will build a great cause together, as for preparing to take refuge in Wu Ju, he is just a mortal, in a remote small county, and is about to be annexed by others, how can he be used as his own support? “

Liu Bei was very happy when he heard this, and stationed in Exian County, and immediately sent Zhuge Liang to follow Lu Su to Sun Quan's place and swear an alliance.

【Timely Rain】

In history, the arrival of Lu Su can be said to have solved Liu Bei's urgent need, and it was a very critical timely rain for him. However, from the available information, there is no record of whether Liu Bei met with Lu Su before or after the Dangyang fiasco.

But it is certain that Lu Su returned to Jiangdong with Zhuge Liang after Liu Bei escaped from Dangyang. The situation at that time was extremely unfavorable for Liu Bei, after the fiasco of Dangyang, Liu Bei can be said to have been disabled by Cao Cao again, although he reluctantly fled back to Xiakou, but the overall situation has not changed at all, Jingzhou has been basically taken by Cao Cao, if there is no arrival of Lu Su, Liu Bei can only be regarded as a remnant of the breath, and its residual strength has no way to resist Cao Cao, so Liu Bei also said that he may flee south to join Wu Ju, and Lu Su's words gave Liu Bei hope again, making him cheer up again.

At that time, Liu Bei's own remnants of the defeated army alone would not be able to confront Cao Cao, but after the union with Sun Quan, it was different, although Sun Quan was not as strong as Cao Cao, but at least one level stronger than Liu Bei, after which the strategic focus of Liu Bei's group began to shift significantly, focusing on uniting Sun Quan against Cao Cao, and sent his right-hand man Zhuge Liang.

【Sun Liu United】

The arrival of Lu Su kicked off the alliance of Sun Quan and Liu Bei, who at that time had a common strong enemy, Cao Cao, who was forced to start a union driven by interests.

For Sun Quan, Jingzhou is the target that three generations of the Sun family want to capture, his father Sun Jian, his elder brother Sun Ce and himself have sent troops to seize Jingzhou, but unfortunately so far have not succeeded, but at this time Cao Cao went south, Sun Quan seized Jingzhou is no longer realistic, so after Liu Biao's death, he turned to win over the Jingzhou group, trying to unite them to resist Cao Cao, at least to ensure that Jingzhou I can't get, Cao Cao can't get it.

For Liu Bei, Sun Quan is the goal that must be united in the "Longzhong pair", originally they may have planned to unite Sun Quan after getting Jingzhou, but later because Liu Bei was too benevolent and did not seize Jingzhou from Liu Cong, so Liu Bei has been lacking a channel to unite Sun Quan, and the arrival of Lu Su solved this problem, Liu Bei himself cherished this opportunity very much, and the cooperation between the two sides slowly began.

Sun Quan's joint resistance to Cao was also the fourth, and the last and most important camp confrontation in the Three Kingdoms era, after the Kwantung Army's rebellion against Dong Zhuo, the confrontation between the two Yuans, and the confrontation between Cao Cao and Yuan Shao.