The reason why Cao Cao's army was besieged on all sides and Jiangdong cremation surrendered collectively was actually related to Cao Cao and Jiangdong cremation. Before the cremation of Jiangdong surrendered, Cao Cao sent a threatening letter to Sun Quan. Just before Zhuge Liang borrowed money from Sun Quan to borrow soldiers and grain, Sun Quan received a letter from Cao Cao, saying that he had an appointment to hunt, but in the letter Cao Cao was actually threatening Sun Quan to surrender early. Otherwise, Cao Cao will send his 80 Wan Shuijun to directly attack Sun Quan's Jiangdong. Therefore, before the collective surrender of Jiangdong clans, Sun Quan and others had already been threatened by Cao Cao, so it was inevitable that they would have popular support.

Another reason why the gentry in Jiangdong surrendered was actually related to Zhang Zhao. Zhang Zhao and some of the gentry said that Cao Cao was the prime minister of the Han Dynasty, and sent troops to attack this place at this time. If the gentry in Jiangdong resisted, they actually disobeyed the emperor of the Han Dynasty. This is treason and very unfair. The most important thing is that they can't beat Cao Cao, so they might as well surrender to the Han Dynasty to be an official and save themselves. That's why they surrendered to the gentry in Jiangdong. Another reason is actually Zhang Zhao's persuasion of the gentry in Jiangdong.

It is worth mentioning that although it is cremation, whether to surrender has a great impact on their interests. If they submit to Cao Cao, then for some Jiangdong gentry, they have changed their leadership. For the gentry in Jiangdong, Sun Quan is nothing special. Cao Cao came to lead Jiangdong just as Sun Quan led this place. If the gentry in Jiangdong did not surrender to Cao Cao, Sun Quan was far from Cao Cao on both sides, so Sun Quan's chances of winning were not as great as Cao Cao's. If the gentry in Jiangdong choose to support Sun Quan, their interests will be greatly damaged. Therefore, in this case, the gentry in Jiangdong surrendered to Cao Cao for their own interests.

Therefore, behind the surrender of the gentry in Jiangdong to Cao Cao, it is more because these gentry decided for the benefit of their own family. So when Cao Cao's army was under siege, these gentry immediately surrendered, because all their belongings were here, and they would surrender like Cao Cao to save themselves.