Battle of Red Cliffs said that the situation is unpredictable. Why can Zhuge Liang borrow the east wind?

At that time, Cao Cao had just defeated Yuan Shao and established his position in the north. After Liu Biao's death, his son Liu Cong was afraid of Cao Cao's influence and was willing to give Jingzhou to Cao Cao in exchange for his own safety. Cao Cao thought that after he got Jingzhou, he could muster and annihilate the southern governors. Unfortunately, it was only in the battle of Changbanpo that Cao Cao discovered that Liu Bei, a fledgling, turned out to be his enemy. In order to unite the feudal lords as one at an early date, Cao Cao was prepared not to provoke Liu Bei for the time being, but to win Dongwu in one fell swoop. ?

In order to make his teacher famous, Cao Cao sent someone to challenge Sun Quan. The original text is as follows:? I was instructed by the son of heaven to fight against the evil rebellion. The flag pointed south, and Liu Cong surrendered. Now I command 80 Wan Shuijun, and I will hunt with the general in Wudi? . Although Cao Cao's words softened, in Sun Quan's view, Cao Cao was threatening himself in the name of the world. If you refuse to surrender, the consequences will be unimaginable. At the same time, Sun Quan called a hundred civil and military officials to hold an emergency meeting on Cao Cao's eastward expedition. At the meeting, all the ministers felt that if Soochow did not surrender, it would become the target of public criticism and be destroyed by Cao Cao's 800 thousand army. Only Lu Su held an objection, thinking that he could fight with you.

As the master of Soochow, Sun Quan's first thought was to save the people of Soochow from the suffering of war, but the most important thing was to keep his position unshakable. At this point, Sun Quan has completely lost his decision-making ability. Fortunately, Sun Ce warned Sun Quan before he died. If there is no military decision, ask Zhou Lang. In order to reassure Dongwu officials, Sun Quan had to order an urgent summons to Zhou Yu, the viceroy, and asked him to return to North Korea to discuss the matter. At the same time, Sun Quan also ordered Lu Su to sound out Liu Bei's tone and see if he could help himself. Just after Liu Bei sent Zhuge Liang to Wudong, Zhuge Liang argued with Confucianism and put forward a plan to deal with Cao Jun. In addition, after Zhou Yu returned to Korea, he agreed with Zhuge Liang, so Sun Quan decided to meet Cao Cao. ?

Just after Zhuge Liang and Zhou Yu made a fire attack plan together, Cao Cao's army arrived as scheduled. However, it was the middle of winter, and the northwest wind hung on the sea all day. Jun is in the north and Wu Jun is in the south. If we attack with fire, we will not only fail to burn the monarch, but will leave Wu Jun in an invincible position. When Zhou Yu raised this question, Zhuge Liang had already thought about the countermeasures, saying that he was proficient in special array and could borrow the southeast wind. Although we all know that the southeast wind was really hoisted in the end, Cao Cao's nearly one million troops were buried in the red cliff fire, but how did Zhuge Liang borrow this east wind?

To understand this problem, we must see why Zhuge Liang insisted on setting the battle date at 1 1 20th of the month. Because this day coincides with the winter solstice, it is the beginning of the cold winter climate, and the air pressure on land is higher than that on the sea, which forms this southeast wind. Therefore, we can see that Zhuge Liang's research on astronomical geography has already surpassed Zhou Yu, Lu Su, Cao Cao and others in the same period. Zhuge Liang is so sure that he can borrow the east wind because he knows the influence of the changes in solar terms like the back of his hand. Otherwise, Zhuge Liang would never attack the solstice of Cao Jun in winter. ?