We just learned about the Caltrop spikes in the ground.
Another type of fortification is a Half Tower.
This is a tower in a castle that is open in the back or on the sides.
It is usually open to the inside of the castle so that people can get in and out easily, but still be protected from the outside.
(from: wikipedia - half tower)
Kid Facts - Blast from the past: Mortizburg Castle
