A cannon fodder battalion, when the enemy came, would hide in the underground. The battalion commander would use gold coins to lure them into training, and all of them would be trained into master archers. What kind of novel was this?

This kind of situation rarely appeared in reality, but it could appear in some novels or fantasy novels such as The Lord of the Rings, Harry Potter, etc. In these novels, there was often an organization called "wizards" or "magicians" who had special abilities to create or manipulate various objects and powers. They might use these abilities to protect their own troops or to cultivate a powerful army for some purpose. At the same time, they might also use money or other methods to tempt the soldiers of the cannon fodder battalion to accept higher level training and equipment.