I had a lizard monster diplomat that spread some sort of disease or poison (fever/numbness --> paralysis/death) trapped in a small corridor. Diplomat or not it killed 20% of my fort without bloodying a claw. I think i posted about it a page or two back.
I'd made a pit zone above it and occasionally tossed it disarmed goblin prisoners to dispose of. Well I hadn't for a while so i qued up a bunch of them and turned my attention to something else. Without thinking about it I'd also tossed a pair of trolls into it's little corridor. And they broke down the doors.
facepalm one
Then it proceeded to wander around my fortress for a while. I assembled the military and when things started spontaneously suffocating again I gave the attack command.
My soldiers attack, but the massive pack of wardogs i've been breeding for years don't join in. They just frolic around watching the mayhem. The tame grey languars, which normally love helping the dogs tear things to pieces don't help either.
facepalm 2
The fight raged all around the fort, my soldiers getting exausted, and very slowly disabled or killed. Because it doesn't seem to actually want to fight much, but the occasional counterstrike or attack would take an arm off a dwarf. The fighting lasted for weeks and weeks. Long enough that the wounds I put on it started scarring up DURING THE FIGHT. It was too big for most attacks to go deeper than fat. (including crossbow bolts)
facepalm 3
Slowly it's injuries pile up, including but not limited to broken limbs, cracked skull and spine broken in two paces. But it's still outpacing, dodging, and occasionally kiling my dwarves... HOW?
facepalm 4
I eventually conscripted some peasants and gave them iron spears hoping one would get lucky and pierce something vital in the body. One actually hit it in the head but it only tore a tendon.
facepalm 5
So...I gave up and called back the troops. It didn't seem to care one way or the other and went back to wandering the halls bringing suffocating death to everyone.
facepalm 6
Then got down to business and its now having a nice chat with my baroness in her blood splattered office while the fort tantrums around them and the dying litter the halls.
facepalm 7
Also, the dogs have finally decided to do something and are busy ripping the throats out of beserk dwaves...thats....good???
facepalm 8
My foe as she stands.