What do you mean "it's foggy at the moment"?

It's foggy all over the sky, and there is fog everywhere. Choosing this kind of weather shows that Zhuge Liang is proficient in astronomy and meteorology and makes accurate predictions. It is precisely because "the river can't even see his face" that Cao Cao dared not "go out easily" and only asked the crossbowman to shoot arrows. Connect the boats with ropes and arrange them in a row, which is not only convenient for unified action, but also avoids getting separated and leaving no gap, so that the area for collecting arrows is large. The purpose of the sergeant's "beating drums and shouting" is not only to bluff, create the illusion of attack, attract the attention of Cao Cao's army, and draw Cao Jun out to shoot arrows, but also to make Cao Jun clear the goal and direction of archery. Zhuge Liang is thoughtful and cleverly arranged. He seized Cao Cao's cautious and suspicious character and used the foggy weather to "borrow an arrow".