well, this is a weird way for a fort to fail. The area is sectioned off by a nicely dug moat, with a wall for the river. For the most part, nothing can get inside - life is good. made a great farming area, a functional road with bridges, and all around happiness without the need for soldiers I even had a renewable resource of rope reed (pig tails never took off for some unknown reason).
the ambush's were at first a cause for laughing. they can't get in here, wah ha ha. Oh, they have crossbows. *shrugs*, I got a nice stockpile of food, get inside everyone. my ornimental attack dogs along the road are subsequently slaughtered, *shrugs*, I still got puppies.
kobold theives inside? how long have they been sitting inside, stuck behidn the wall. hah, that's kind've funny. I watch the goblins kill them - life is good again while we happily eat a huge stockpile of yummy things.
Goblin inside? huh? how did he... holy crap. A few dove into the river and climbed against the current into a pond. His friend got stuck and died down there. Anyways this crossbow goblin is running around my fort without any bolts left, terrorizing people but otherwise causing no harm.
So, I naturally get my two legendary miners to chase him around at beat him to death. After a season and a half they were both slaughtered. He keeps running around and... nothing else.
I was going to open the lever to the main bridge gate, but it is being guarded by a squad of ambushers on the other side of the moat. I can't even commit suicide at this point. Instead I just slowly watch my dwarves be terrorized until they all go berserk and destroy everything.
Death not by tantrum spiral, nor magma, nor evil things, but rather by being scared by the look of goblins beyond reach.
Eventually a dwarf did go berserk, destroyed a road and a few other things, then proceeded to, by himself, slaughter my entire fort - including the goblin and puppies. the goblin actually died quite brutally, being beaten to death with bare hands, killing him and drowning him in a now blood-filled pond.
humans came, elves came, got slaughtered by the goblins outside. Those goblins got bored and left. I still have a berserk dwarf preventing me from even opening the front gate.
Ironically the only thing that survived was a caged goblin thief and a 2 year old. The goblin saw the whole thing. I imagine him eventually getting free and telling the story to his friends. "you'd never believe what I saw!".
Oh, the last sane dwarf to die was a 2 year old. She complained of thirst and hunger, forced to endure the loss of a father, mother, and sibling (and endured them rotting). She has seen death and slept on the floor. She slept on the floor, complained of a lack of chairs, and was caught in the rain. She even sustained major injuries recently.
However, she is content. What good things balanced this out? She admired a nice restraint, was satisfied at work, and at some point she was saved during the whole thing. She crawled to the top floor of my only built home, and died in bed.
Wow....