Right, so. Your fortress is puttering along, life is good, and suddenly "The monster Badguy McNastybeast has come!"
Get the military dwarves moving. Pull people inside. Check the traps. And then...
Something really silly happens.
What are the most underwhelming megabeasts you've seen?
I just had a hydra show up on my map. This worried me - my military ALWAYS lags behind as I try to have awesome equipment(well, awesome armor) before I even draft them. I had a couple marksdwarves and some war dogs. Drafted some more marksdwarves in a hurry.
As they were grabbing gear, an existing pair went more or less to their places. One of them... had a pair of steel bolts in the quiver. The other didn't have that much, and charged out into the open, to boot, beyond the fortifications.
The hydra tore him in half without pausing, while his squad leader just stood there and didn't even bother USING those two steel bolts. The hydra went up and around toward the trade depot...
And there it met one of my war dogs.
Did minor(grey) damage to one eye and another neck before the hydra sliced it open, then lumbered around the crossbow tower and toward the trade depot...
And collapsed.
The dog had inflicted enough harm to knock it out cold. Before it could recover, the caravan guards pounded it into the dirt.
Total casualties: One dog, one marksdwarf. An earlier goblin siege inflicted DOUBLE that, and it wasn't even a very imposing siege - not a marksman among them. (Thankfully, the marksdwarf who distinguished herself THAT day - seven kills to her name alone - isn't the one who was dumb enough to swing at the hydra with an unloaded crossbow.)
The real injustice? The dead dog was assigned to, I think, the dead marksdwarf. Or maybe assigned war dogs don't count as pets. Either way, the dwarves just hauled the dog off to the refuse pile.
Well, if they're not going to give their four-footed savior proper respects, I'll have them build a shrine in its honor. Suggestions? Other tales of not-so-world-shaking terrors tripping over their own feet and becoming easier prey than a hoary marmot?