The Battle of Red Cliffs is a famous campaign in Chinese history that took place in 208 AD. In this battle, Sun Quan chose to ally with Liu Bei to jointly oppose Cao Cao's powerful army. So, why did Sun Quan make such a decision? This article will analyze it from the perspectives of historical background, strategic considerations, and interpersonal relationships.

Firstly, historical background. Before the Battle of Red Cliffs, Cao Cao had unified the north and possessed strong military strength. In order to achieve the ambition of unifying the country, Cao Cao decided to attack Jingzhou in the south and then eliminate Sun Quan in Jiangdong. Under this circumstance, Sun Quan faced tremendous pressure and had to seek foreign assistance to resist Cao Cao's attack. It was at this time that Liu Bei led his troops southward to seek refuge with Sun Quan. Therefore, from the perspective of historical background, Sun Quan chose to ally with Liu Bei due to the common threat posed by Cao Cao.

Secondly, strategic considerations. One important reason for Sun Quan to choose to ally with Liu Bei was to disperse Cao Cao's forces. At that time, Cao Cao's army was mainly concentrated in the north, while the southern army was relatively weak. After Sun Quan and Liu Bei formed an alliance, Cao Cao had to divide his forces to deal with two enemies, thus weakening his strength.

Another strategic consideration was to leverage geographical advantages. The Battle of Red Cliffs took place in the Yangtze River Basin, where both Sun Quan and Liu Bei were familiar with the terrain. They could utilize the geographical advantages to formulate appropriate strategies and better resist Cao Cao's attack. Additionally, Sun Quan had a powerful navy, which was also a crucial factor in their victory in the Battle of Red Cliffs.

Thirdly, interpersonal relationships. Prior to the Battle of Red Cliffs, Sun Quan and Liu Bei did not have much of a personal relationship. However, when faced with a common enemy, they were able to put aside personal grievances and work together. Lu Su played a pivotal role in this. As an important advisor to Sun Quan, Lu Su advocated an alliance with Liu Bei to jointly resist Cao Cao. Under his persuasion, Sun Quan ultimately decided to ally with Liu Bei, demonstrating his broad-mindedness and foresight.

In summary, Sun Quan chose to ally with Liu Bei primarily due to considerations such as the common threat posed by Cao Cao, strategic considerations, and interpersonal relationships. In the Battle of Red Cliffs, the Sun-Liu coalition successfully defeated Cao Cao's powerful army with their combined strategic wisdom and unity, laying the foundation for the three kingdoms' coexistence.

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