How did the ancient army fight at night and in foggy days? The weak side can win by fighting at night.

There is a truce between the two sides in most foggy nights, but there are many examples of sneak attacks at night. In ancient times, scouts were sent in advance to find out the enemy's encampment and deployment, and combined with mountains and rivers, night raids were often surprisingly successful. Horses wrap their feet, and there is always fire in the camp where people hold medals, so it is not invisible. The same is true in foggy days.