The grass boat borrows an arrow, and Zhuge Liang can calculate that there is fog. Why not calculate that it will rain when Sima Yi is burned to death?

Borrowing Arrows from Grass Boat does not exist in real history, but is a drama imposed by the author Luo Guanzhong for the myth of Zhuge Liang. In the novel, the time when the straw boat borrowed arrows coincided with the rise of the overall strength of Shu, so this plot was arranged to highlight Zhuge Liang's strategizing, but he did not defeat Sima Yi in the battle of Shanggu precisely because he set fire to it.

First, borrowing arrows is a myth, Cao Cao Can lost, and Sima Yi can't die.

Judging from the background of these two incidents, the time when the grass boat borrowed an arrow was in the rising period of Liu Bei's power and was about to reach its peak. The description of all kinds of characters is never said, which shows that the author Luo Guanzhong is obviously a little biased towards Shu, so he mythologized Zhuge Liang, thus "fabricating" a story of borrowing an arrow from a straw boat, and the more mysterious empty plan behind it is also a play imposed on Zhuge Liang by Luo Guanzhong, which does not exist in the official history.

The battle of Shanggu coincided with the weak national strength of Shu, when Liu Bei had passed away. If Zhuge Liang killed Sima Yi in the Battle of Shanggu at this time, then Shu is likely to be unified and complete the great cause of reviving the Han Dynasty. If Zhuge Liang dies at this time, what is left in the Three Kingdoms is Sima Yi and other newly rising forces, which is also the development direction in the official history.

Second, Sima Yi's immortality is not God's blessing, but Zhuge Liang's "pot"

In the battle of Shanggu, Zhuge Liang forced Sima Yi and his party to go up the mountain. Zhuge Liang used the most direct method-burning eyebrows and making a quick decision. However, Zhuge Liang neglected a very serious problem. When Zhuge Liang burned the valley above, the fire heated the surrounding air, and these hot vapors rose to the sky and contacted with cold air to form rain. It was these rains that saved Sima Yi who was trapped in the fire, and Zhuge Liang couldn't figure it out.