This was in 34.11.
One of the largest sieges I'd ever seen had arrived. It seemed to be composed of the entire goblin civ, I saw even fishery workers and many civilians, all armed like soldiers. There were even goblin kids in the mix. The civ leader, an amethyst spider shaped into human form with a poisonous bite, was at the head, riding atop a jabberer. I was ready. This was one of my forts where everyone but the miners were in the military, and decently trained. 300 goblins, about 40 of each humans elves and dwarves, and even some kobolds, plus all their war beasts, and their demon civ leader, versus my fortress, including roughly 100 dogs and a lot of tamed cave crocodile pets, as well as a few dozen assorted war animals. I can take the- The elves have mobilized the full force of their lands against me?... Another bunch of elves, riding on unicorns... I can handle this... Another forgotten beast? But there was already three down there... D-did my champion just go into a mood?... He'll be back soon enou- he wants shells... And a bunch of babies are being born... Only to be thrown into the goblin meat grinder immediately while their mothers fight and die in the most pathetic manners possible, their fathers crushed under boot and now only fit for beak dog food... Worst of all: FPS 1.
I had to abandon that fort in mid siege, FPS death, as well as many undwarvenly deaths of my own dwarves... They were too much for me.