At the turning point of the Three Kingdoms history - the Battle of Red Cliff, the Eastern Wu army did play a major role in the battle. However, this does not mean that Sun Quan did not need to form an alliance with Liu Bei. In fact, from a strategic perspective, this alliance was of great significance to Sun Quan.

Firstly, we need to understand the background of the Battle of Red Cliff. At that time, Cao Cao led a huge northern army southward, intending to unite the whole country at one stroke. Facing such a powerful enemy, neither Sun Quan nor Liu Bei had much chance of defeating Cao Cao alone. Therefore, they chose to unite and resist Cao Cao's invasion together.

Secondly, although the Eastern Wu army bore most of the combat tasks in the Battle of Red Cliff, this does not mean that Liu Bei did not play a role. Liu Bei's participation forced Cao Cao to divide his troops. At the same time, Liu Bei's presence also attracted some of Cao Cao's attention, thus reducing the pressure on the Eastern Wu.

Moreover, the alliance between Sun Quan and Liu Bei was not only military cooperation, but also mutual political support. In the three-kingdom pattern at that time, the Sun-Liu alliance helped maintain the situation of a tripartite balance and prevent any party from becoming too powerful and posing a threat to the other two.

Finally, we cannot ignore the personal relationship between Sun Quan and Liu Bei. According to historical records, the two had many interactions before the Battle of Red Cliff and established a certain friendship. The existence of this personal relationship undoubtedly added trust and stability to their alliance.

In summary, although the Eastern Wu army bore the main combat tasks in the Battle of Red Cliff, the alliance between Sun Quan and Liu Bei still had significant strategic significance. This alliance not only helped them jointly resist Cao Cao's invasion, but also strengthened their relationship at the political and personal levels. Therefore, we can say that the alliance between Sun Quan and Liu Bei was their best choice in that particular historical period.

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