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
knight
soldier
I'm a soldier. I'm paid to kill. This is a job, nothing more. I'm a mercenary in a lot of ways.
Here sir, I found this. Very good. I believe the enemy will approach from the east, and try to encircle us. where would you like my group at? We'll need most of your men here on the wall. Could you spare a dozen marksmen? easily! how many do you want ready to exit the battlements if needed? We'll take two dozen men to this point here. Then, after unleashing a volley from behind the hill, they'll join my cavalry, riding two to a horse, so we can drop you off here, behind their flank. Ah, cannot drop my good luck coin. Alright, I can easily get that set up. We have a really good army right now. Yes; the forces of the scoundrel King Graxia might seem tough, but they're mostly peasant conscripts, more fit to hold an apple basket than a spear. They will not take this fortress. Do you think they could be hiding any secret weapons? I do not think so, but it is possible. It never hurts to remain vigilant I've heard whisperings of some foreign mercaneries they hired Hm. That is news indeed. Such rumors had not reached me; what have you heard?