Okay, so the whole rotgut/narcolepsy thing turned out to be a problem after all... I lost about a dozen citizens who passed out in the main entrance and fell onto weapon traps. Lesson learned!
I just witnessed an absolutely epic battle with a wyvern. Managed to get nearly everyone safely underground, closed the gates, and watched in awe as two full squads of experienced crossbow dwarves hit it with about 700 rocktip, bone, and copper bolts. Nearly every shot "glanced away" though they knocked off two of its toe-claws. So I deployed my Plan B: two captured deamon invaders and five large horses, all sprung from cages simultaneously. The first deamon stepped into a weapon trap and disembowelled himself. The second deamon managed to land two or three solid hits before the wyvern ripped it apart. Unfortunately, the crossbow squaddies massacred the large horses before they could do much more than panic.
Well, now the wyvern's at least slightly injured, surely some of the crossbow bolts will surely strike home? Like Bard's Black Arrow taking down Smaug, right? Well, another 250 or so bolts smacked into the wyvern -- only now instead of "glanced away" they're "fracturing the skin." (Meanwhile the manager's down in the metalworks screaming at the weaponsmiths, "Steel bolts! Lots, thousands, right now!")
The wyvern laid waste to our alpaca pens and survived the hundreds of "fracturing the skin," sort of like papercuts I guess? Eventually I gave up and sent in the Wrecking Crew, battle-hardened weaponsmasters one and all. They finally, FINALLY slew it after four pages of grievous wounds, dodging among the whizzing -large horse bone bolt-s. None of
We butchered it, preserved the hide. It must look like a sieve.