OK, I'm suffering from my first siege - in this particular game (I've played before, but not in the last couple of years), and I don't see how my marksdwarves could be any dumber. This sure doesn't seem to be an improvement from the last time I played the game!
I've got walls on the ground level - not all the way around, yet - with a moat on the outside. There's a bridge at the entrance. On the floor above, reachable ONLY from below, from inside my fortress, is a wall of fortifications around the outside. Again, not all the way yet. (All this takes a lot of time.)
So there's a siege of goblin bowmen. I tell my marksdwarves to patrol along that wall of fortifications, one story up. What happens? Well, half of them decide to go all the way around and walk back and forth in the bridge opening, one floor
down from where they're supposed to patrol! Yeah, they make perfect targets there.
One particularly bright dwarf gets the level right, but manages to squeeze past the fortifications on the upper wall and stand out in the open, where he also gets peppered with arrows. (OK, I guess I should have stopped the patrol some distance from the end, but that does seem willfully suicidal.)
A few dwarves do get the level right
and get close enough to fire through the fortifications. They haven't actually hit anything, but it's still an improvement. (As far as I can tell, neither burrows nor traffic orders make the slightest difference to military dwarves. At least, I've tried both, without success.)
Oh, and I opened the bridge while some of the goblins were standing on it. That did nothing but stun them briefly -
very briefly. Didn't that used to cause damage? It's a drawbridge, not a retractable bridge.
Oh, well. Maybe if my marksdwarves ever get better they won't have to stand right next to the fortification. (I'm not going to hold my breath.) But why, oh why won't they at least patrol on the right
level?
Well, my hope now is that all the goblins fall in the river and drown, which is what happens to every dwarf that gets anywhere close to it. Actually, they all get swept over the waterfall, so some die from the impact, before they can drown. That's not going to bother the giant olm the goblins brought with them, since it's amphibian, but if the 15 bowmen fall in the river, that would help a bunch.