We had a siege. I let the goblins wander into the drowning hall, then pulled all the necessary levers. Slowly, slowly, the hall began to fill with water. Meanwhile, I had two dwarves die of thirst! I hadn't noticed until it was too late, but we had run out of booze! A few more dwarves die of thirst, and before I knew it, we had a full-blown tantrum spiral! Dwarves being shot down in the dining hall, mothers punching their babies, and all other sorts of complete chaos broke out! To top it off, one of the very first things destroyed was the lever that operates the floodgates that drain the drowning hall, mucking up the whole project...
The tantrum spiral continued for a couple months. No dwarves were planting, brewing, or cooking; so the food stockpiles never had a chance to recover. No dwarves could spare any time to bury the bodies, or even remove them from the fort.
A caravan arrived simultaneously with a siege, and got massacred. With only 4 dwarves left, I figured 'What the hell...' and ordered my military to attack. A Swordsdwarf ran up, got his shield hand lopped off, then retreated. Then, a hammerdwarf came up, and just started obliterating this platoon of goblins. He didn't even get a scratch on him! He did this with the other two squads of goblins, routing the siege.
It's been a couple months since then, and he still just guards the front gate, trains occasionally, and sleeps. There's 1 other military dwarf still alive, and it's the one-armed swordsdwarf who was also just elected the mayor. He was conducting a meeting while sparring with my Hammerdwarf, NigelThornberry, even though there was no liason on the map. Perhaps he was conversing with the human ghost merchants who have begun following him?
The food and drink from the massacred caravan have been used up, and we haven't gotten any migrants. Nigel Thornberry guards the front gate, as a child runs in circles, starved, dehydrated, and being chased by a ghost. Nigel is oddly content, and hasn't had to eat or drink the whole time I've been watching him...
Yep, I think our eventual sole survivor is a Legendary Hammerdwarf Vampire.