Sima Yi was saved by a heavy rain. Why didn't Zhuge Liang order the killing?

The battle of Fanggu was the best opportunity for Zhuge Liang to catch Sima Yi, and it was also the last good meeting. Unfortunately, at the last minute, a rainstorm came from the sky, which extinguished the fire and the hope.

some people say that Zhuge Liang can call the shots, can't he? Aren't you very good at watching the weather forecast? Battle of Red Cliffs, you can borrow Dongfeng. Why not borrow it again this time to blow away the rainstorm?

Actually, Zhuge Liang can't be blamed. Zhuge Liang watched the weather forecast the night before, and the satellite cloud picture clearly showed sunny days. The reason why it rained heavily was not related to the weather forecast, but to the heat convection.

as we know, the upper valley is similar to a gourd, with only one mouth, one mouth for the exit and one mouth for the entrance. The valley is narrow at the bottom, wide in the middle and narrow at the top. When the valley floor is ablaze with a raging fire, the hot air rises from the bottom and meets the cold air at the top of the valley, forming a small range of convective weather, and then it rains heavily, which is the same as the thermal convective weather in summer.

Although Zhuge Liang watched the weather forecast, he didn't understand physics and the principle of overheating convection, so when the rainstorm put out the fire and saved the lives of Sima San and his son, Zhuge Liang vomited blood and sighed, "Man proposes, God disposes, and you can't be strong!" .

So, the fire saved Sima Yi and his son. Why didn't Zhuge Liang make a hullabaloo about instead of sending troops to kill Sima Yi immediately?

There are three reasons:

First, there are soldiers outside Sima Yi. Sima yi just took a small group of people into the upper valley, and the big group stayed outside. In The Romance of the Three Kingdoms, Sima Yi just rushed out and met Zhang Hu and Le Chen who came to meet him. At that time, Ma Dai's army was small, with only 5 people, and he didn't dare to chase them.

second, Zhuge Liang was careless. Zhuge Liang has always been cautious, but this time he was careless. He thought that Sima Yi had entered the valley above, and the fire would definitely burn him into a roast suckling pig. There is no need to send more troops, but people are not as good as heaven.

thirdly, the upper valley is not suitable for ambushing too many troops. At that time, Sima Yi huddled in Dazhai, and became a little puss-head, unwilling to come out anyway, trying to fight with the Shu army for consumption. The Shu army came from afar, and the supply of food and grass was insufficient, so Zhuge Liang adopted various strategies to lure the snake out of the hole.

To lure the snake out of the hole, we must be very careful not to let Sima Yi, an old fox, find any clues. Zhuge Liang sent two generals, Wei Yan and Ma Dai, and gave them 5 troops respectively. After two defeats, Sima Yi was led to the upper valley. If we had ambushed heavily, with Sima Yi's cunning, we would have found the clue and wouldn't have been fooled.

of course, the above is purely a romance. There is no such thing in history. In the official history, there was no battle in the upper valley, Zhuge Liang did not set fire to it, Sima Yi did not come out, and there was no heavy rain.

In the History of the Three Kingdoms, Zhuge Liang tried to draw Sima Yi out for a decisive battle, but Sima Yi just couldn't come out. Zhuge Liang was so anxious that he didn't mention it at one breath, and he was so angry!