Well, if Cao Cao has to win the Battle of Chi Bi, he needs Guo Jia who dies after the Battle of the Wuhan Mountain/Mount Bailang and his death affected Wei in a bad way unfortunately. If the genius Guo Jia is still alive, the Battle of Chi Bi would have happened differently (with Cao Cao being victorious).
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Well, if Cao Cao has to win the Battle of Chi Bi, he needs Guo Jia who dies after the Battle of the Wuhan Mountain/Mount Bailang and his death affected Wei in a bad way unfortunately. If the genius Guo Jia is still alive, the Battle of Chi Bi would have happened differently (with Cao Cao being victorious).