There are some cannons that are made with wood and can be opened up. We show young people how they worked at the time. Gunpowder was inserted here, someone had to clean the cannon, etc. That is what they see. It is the same thing for muskets. We explain how they worked and that soldiers stayed close to one another because bullets did not fall very far from the muskets.
The purpose is not to show people how to wage war, but rather give them a visual demonstration of how things were done at the time, on the very site where the events took place.