Zhuge Liang can burn Cao Cao by the east wind. Why didn't Sima Yi expect it to rain?

In the later period of the Three Kingdoms, Zhuge Liang made a northern expedition to the Central Plains and visited Qishan six times. On one occasion, Zhuge Liang laid an ambush in Huluyu on the day of the sixth month of the lunar calendar, intending to attack Sima Yi's army with fire. Wan Li is clear and sweltering. This is an excellent opportunity to use fire attack. Zhuge Liang used a trick to lead Sima Yi's big team to the valley …

A cautious man like Sima Yi, if he is not sure that the main force of the Shu army is not in the upper reaches, he can't go in to cut grain and grass. After Sima Yi entered Shanggu, it was like entering a dead end. Zhuge Liang only needs to seal the valley mouth with fire and a small number of soldiers, and then set fire to the valley, so that even if the main force of the Shu army is not there, he can win more with less by virtue of favorable terrain. Sima Yi and his son could not escape this fate, crying and waiting for death. However, just as the fire was raging and people were trapped, Sima Yi's whole army was about to collapse and the weather was unpredictable. Unexpectedly, there was a heavy rain at the critical moment, which put out Zhuge Liang's fire. The heavy rain doused Zhuge Liang's ambition to help Han resist Wei, and made him sigh, "Man proposes, God disposes, and you can't be strong." However, why did it rain heavily at that moment? How is the rain formed?

Zhuge Liang can borrow the east wind and the straw boat can borrow the arrow, so it is calculated that there will be fog on the river. Why didn't you know it would rain in the valley above? I should have ambushed a group of soldiers and horses on both sides, even if Sima Yi could get away, then cut off his way and killed him.

1, judging from the event:

Borrowing the east wind means that Zhuge Liang observes the sky at night and finds that the wind direction will change in a few days. In the south of the Yangtze River, the climate is very regular due to the subtropical monsoon climate. If you read the novel carefully, you will find an explanation in it. In fact, everyone in Cao Cao's camp knows that sometimes there will be southeast winds. But this plan was planned by Sun Liu Lianjun, so they took this incident into account when designing the fire. Even if Cao Jun knew this phenomenon, he would not easily associate this incident with false surrender and artillery attack, let alone prevent it in advance. Therefore, Zhuge Liang used the east wind to predict that the timing of Huang Gai's false surrender could just be arranged when the southeast wind blew.

Shanggu is also called "Gourd Valley", and the whole valley is like a gourd. Zhuge Liang set a fire at the bottom of the valley, and the hot airflow formed by the fire could only rise, and it rose very high. As we all know, it is very easy to form "rain" when hot air meets cold air in the sky. This is Zhuge Liang's sorrow. Even if he can see the sky at night, it is estimated that he will not understand modern science, nor will he know the relationship between terrain and fire and rain.

2. Geographically speaking:

Chibi is located in Hubei Province, not too far from Zhuge Liang's seclusion. Moreover, Zhuge Liang may have more time to study local astronomy and geography when he was young. Shanggu is in Weinan. There seems to be no such place in reality, which was invented by Luo Guanzhong. In addition, Zhuge Liang has been in a high position at this time, and there must be a lot of things to deal with (everything is very detailed). I think he may not have enough time to re-study the local weather changes, but rely on past experience to judge that it will not rain in the upstream valley.

3. From the author's point of view:

In Romance of the Three Kingdoms, Liu was revered and Cao was relegated. In order to reflect Zhuge Liang's wisdom, the incident of borrowing Dongfeng/Fangshanggu is fictional (not necessarily fictional, but even if these things exist, they will not be preserved: the former has nothing to do with the overall situation, and it is impossible for the core members involved in the war to know; The latter was completely defeated by Sima Yi, the emperor of the Jin Dynasty, Xuan Di. Of course, historians of the Jin Dynasty dare not write, and records of other countries will not be preserved. Joining Dongfeng not only improved Zhuge Liang's "divine power", but also did not conflict with history (what history can determine is that Cao Cao defeated Chibi, and the specific process is not necessarily accurate, and opinions vary). The enemy of Shanggu is Sima Yi, who is obviously not dead in history. There are other important acts after Zhuge Liang's death. Of course, you can't write him to death. However, in order to show Zhuge Liang's strategy, Sima Yi was the best target candidate, which created a contradiction: Sima Yi was in danger and he was alive, so "rain from heaven" was born. This technique is similar to the "God-given Spring" after Si Mazhao was besieged by Jiang Wei.

Zhuge Liang and Sima Yi feared each other. They are the same age and each is his own master. Kongming is loyal to Sima, but Zhong Da has the heart of stealing the country. Both of them are consultants and equally honest. It is said that Zhuge Liang is afraid of Sima Yi because it is a draw when two people fight. The two of them only had two brief head-on confrontations in their lives, both of which ended in confrontation between the two armies. Whoever wants to attack is the loser, which is also the reason why Zhuge Liang failed for the first time. Zhuge Liang prepared enough food and grass for the second time, but Sima Yi resolutely refused to participate in the war. Whoever goes first is the loser. In the final confrontation between the two of them, it can be seen that Kong Ming was exhausted, and Kong Ming even humiliated Sima Yi by abusive means, but Sima Yi just didn't fight. It can be seen that Zhuge Liang has nothing to do with Sima Yi.