We just learned about the short wall on top of a castle called a Parapet.
Another part of a castle is the Crenel.
Sometimes people would have gaps in the parapet wall, so that they could attack their enemies with arrows or even throw rocks on them.
The gap or low spaces on the parapet walls are called the crenel, or embrasure.
(from: wikipedia - battlement)
Kid Facts - Blast from the past: Balmoral Castle
