Why on earth did Battle of Red Cliffs Cao Cao believe in Huang Gai?

Because at that time, Cao Cao was very confident in his own strength and thought that Battle of Red Cliffs was just a small battle for his Cao Jun, and he would definitely win. Moreover, Huang Gai's identity at that time was embarrassing for him, because Huang Gai's military exploits were actually very high, but his rank was not high, so Cao Cao's subjective consciousness thought that Huang Gai was dissatisfied with his boss's failure to promote himself, so he easily believed that Huang Gai really wanted to surrender.

At that time, there were many advisers in Cao Cao's army, all of whom were very powerful figures, but none of them persuaded Cao Cao. The main reason was that Cao Cao basically didn't listen to the opinions of military advisers at that time. He is very arrogant. He thinks he can win the battle. Whether Huang Gai really surrendered or faked it doesn't matter much to him. Cao Cao is conceited. Because he misjudged the weather at that time and thought that the east wind would not blow, he thought that even if Huang Gai pretended to surrender, no one would set himself on fire with the east wind, but in fact the east wind did blow, which caused heavy losses to Cao Jun and led to his own failure.

And the yellow cover is a very effective chess piece. Although Huang Gai's rank is not high, he still has some influence in the army. If Huang Gai really surrendered, Cao Cao could conquer Jiangdong and unify the world without wasting a single soldier, so he thought that Huang Gai's surrender could reduce the casualties caused by the war, quickly defeat Wu Dong and reduce the killing.

And Cao Cao is very underestimating his enemy. He thinks that his opponent's strength is not as good as his own, so he is relaxed in strategy, and he especially believes in his personality charm. Because he did fight many battles, big and small, and was invincible, Cao Cao believed that Huang Gai was going to surrender and it was understandable to follow him, so he easily believed Huang Gai. Moreover, Huang Gai's risks are well done. Some of them have blinded Cao Cao's judgment and thoughts, blinded his eyes, and made him believe Huang Gai easily.