So I'm next to a necromancer training school, it seems. I didn't check this before embarking, but they sure keep coming. I have four in cages now. (I just liked this embark because it has a little bay of the ocean coming into a forest.)
My initial defenses included moat+wall. Bridges over the moat. (Later, I added archers on top of the wall.)
When I got past my first undead siege, I set my dwarves to dumping the corpses in the moat. Then I blocked it in. Wall at the northeast, locked door at the south.
Ground-level (Z=0) view of the walls and moat.Moat-level (Z-1) view, with door and wall. The two holes in the floor are a later addition, keep reading.This was good. The next undead siege, a hundred or two zombies and skeleton sprang up and had a harmless undead cocktail party in the moat.
This last siege, same plan as before. Beat the undead down, toss them in the moat. But I had been thinking. For just-in-case purposes, and framerate purposes, too, I should get rid of the corpses entirely. Magma's 120 Zs down on this map, so I don't want to dump them in magma. I'll atomsmash them. Hundreds are already in the moat, so I don't want to haul them somewhere else. I'll build the bridge a level below that, channel it out to drop them all into place, and smash them there.
Here's the smasher right below (Z-2). Bridge is up right now, with a pile of corpses to smash.But wait, says I. I should close up those holes. Hatches, linked to the lever. That way the corpses will fall down to be smashed, but when not in use, I'll close them against flyers.
Experienced players will have already spotted the problem. Hatches open instantly, bridges with a delay. I knew about this, but didn't think it would kill 24 dwarves at a time.
Here's what happens if you do this.
-Dwarf pulls lever.
-Immediately, hatches open.
-Immediately, 200 corpses fall through open hatch onto down drawbridge.
-100 ticks later, drawbridge raises.
-(Here's what suprising) Almost none of the corpses fly around the drawbridge room on Z-2. Instead, they shoot up and out through the holes.
-Some of them land southward. One or more lands on the
open hatch covering the main stairs.
-If you use a "central staircase" design, then when the zombie corpse hits somebody, that somebody
will fall down about eighty flights of stairs. He'll hit anybody else on the stairs, and they'll fall too. Until the zombie corpse and the pile of mangled dwarves reaches a closed hatch.
24 dwarves this cost me.