But again, the main difference is that the attacking archers have line of sight and can fire away while the defenders can't. Think of it this way, if you go up to a gap and can see 4 archers, all 4 can hit you.
That's inconsistent. First you say the that if you could see the attacker to shoot him, he could shoot you back, then you say that even when the attacker could hit you, you wouldn't be able to return the favour. So which is it?
He meant that the defending archers are standing back, not participating in the shootout. Only 1 out of every 4 archers on the defending side can actually shoot, while the rest are stuck out of Line of Sight. However, the archers on the ground are all able to shoot, non-stop. It means that, all things being equal, the attackers have the advantage. 20 defending archers vs 20 attacking archers is actually 5v20 at any given moment.
(My figure of 1 out of 4 was totally made up, for the sake of clarification)
Thanks, that makes sense. But that's only if you have a large band of archers standing out of firing position. Probably happens a lot with computer opponents but the player has options, some of which have been laid out in various places in this thread.
The defenders still have the advantage of standing behind battlements and only having a portion of their hitbox exposed, while the attackers are generally standing out in the open and can be hit anywhere.
Maybe it's nonsense, maybe I just suck, but I generally have a way easier time hitting people as a defending archer, then I do as an attacking one.
Same here, so maybe I suck too.

As several people have pointed out though, the AI has little trouble with headshots, so the parapet doesn't protect as much as it would appear to. Some protection is better than none, however, and not all attacking archers are guaranteed to be sharpshooters. Additionally, merlons do limit attacker opportunity, which some posters seem to have missed. Also, if you have shields in front of your archers, those shields will eat up a lot of incoming arrows. The bottomline is that in most situations battlements
should help the defenders more than they help the attackers - but some players seem to have observed the opposite. Dunno.
Ah, of course.. forgive me; I was half asleep when writing my previous post xD
I'd be interested in hearing your actual character's backstory, though 
*in my most annoyingly grandiloquent voice* You are forgiven, my son.
Well, I've a bunch. PMs, you think?
I should probably say right now that I didn't use my normal voice for it.. you might get a bit of a scare, otherwise xD (If you're interested: http://forums.taleworlds.com/index.php/topic,201906.msg5219802.html#msg5219802)
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Remember that they only have 50 proficiency in Archery.. I really don't see why a Slaver unit would have a bow, to be honest. :s
That probably should be bumped up a little, yea. Suggestion time?
Anyway, I think elephant-mounted archers are historically accurate. Pretty hard to hit anything with a melee weapon from way up there, right?
Although... hmm... that would make the SC the only unit in the Manhunter tree that can end up killing rather than knocking unconscious a target!
Aye, they do, but I meant more along the lines of where they actually spawn on the walls (Archers in the towers, Infantry at the ladders, etc.).
If I'm not mistaken, the first troops to spawn will spawn closest to the wall. In any case, I don't remember ever having any trouble getting the shields to the front and the bows to the rear. Hmm....