In fact, Liu Bei's attack on the Eastern Wu was not unreasonable. Before the Battle of Yiling, Cao Wei and Shu Han had fought many battles, with both sides suffering losses. At this time, Cao Wei did not immediately attack Shu Han, but took a "defensive posture" to wait for the opportunity. The Eastern Wu led by Sun Quan took the opportunity to strengthen its own army and expand its territorial scope, which posed a huge threat to Shu Han. Therefore, Liu Bei believed that it was necessary to eliminate the Eastern Wu as soon as possible to ensure the safety of Shu Han.

However, there were also great risks in attacking the Eastern Wu. Although Sun Quan was not as powerful as Cao Wei, he had a very outstanding general - Zhou Yu. Zhou Yu defeated Cao Cao in the Battle of Red Cliff, and his military talents should not be underestimated. In addition, the Eastern Wu had a superior geographical location with the obstacle of the Yangtze River, which made it difficult for Shu Han to break through. Coupled with the death of Zhang Fei, the morale of Liu Bei's army was also greatly hit, and the entire Shu Han force was almost on the brink of collapse.

But Liu Bei did not give up. He sent generals such as Zhao Yun to attack the Eastern Wu and ultimately achieved some victories. However, for the entire Shu Han force, it did not change the fundamental situation. In fact, the Battle of Yiling was the beginning of the decline of the Shu Han force, which ultimately led to its destruction.

Therefore, although the death of Zhang Fei was a huge loss for Liu Bei's force, even if Zhang Fei had survived, it could not guarantee the victory of the Battle of Yiling. The victory or defeat of a war depends not only on the bravery and talent of individuals, but also on the combined effect of many factors.

Overall, the Eastern Wu may have been better, as there were not many outstanding figures in the Eastern Wu, except for Lu Xun.

And the reason why Lu Xun was able to defeat Liu Bei was just because he took advantage of the situation, which directly led to Liu Bei's death in Baidi City.

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