The battlements are on top of the castle, in between the towers. These walkways have raised walls to prevents soldiers from fall off them or being picked off by archers. The walkways have narrow slots carved out at regular intervals for archers to aim through with getting hit themselves. There are also wider slots at longer intervals with cannons stationed at them. Flush against the outside walls are short, long boxes for soldiers to place their extra weapons in when preparing for a seige.
Battlements, Outside Castle
archer
knight
I am a knight in the royal army. I am strong, brave and fearsome. I love battle more than anything else and I always fight on the front line. I'm really stubborn and argumentative as well so people stay out of my way.
Take your shot, friend. We are to spar! I thought we were just to patrol the battlements in case the enemy launches a secret attack. I don't care, the less time I spend sparring the less trained I will be! If I were to take a shot with my bow you would be a dead man. No one is as good as I. You think so eh? What a fool you are! Only one fool here. I wish the enemy would attack. I could use a good fight. There certainly isn't one to found here unless they do. You'll pay for your insults! Too slow fat knight! You think I need this? Ha! I love the heat of battle.  As do I, nothing gives me more of a rush!  Except lying with your ugly mother.