Recently, my fort almost fell to a blind cave ogre. Both squads of fighters, heavily injured from their battles with its mate, were totally torn apart by the horrid thing, and it wandered through our dining hall, throwing kittens across the room and killing any armed dwarf it saw. Eventually, I was reduced to seven dwarfs, two of them lying half dead in the hospital.
...And suddenly, totally out of the blue, I had a new hammerer. I was looking at the various jobs under the {u} menu when I realised it said that he was a "vampire hammerer"... I zoomed to his location, and couldn't see him (it was the bedroom wing) and then checked {u} again, and he was a normal hammerer. Hmmm.
I put him in his own squad, with weapons, and sent him to kill the beast in the dining room. Nothing to loose, right?
The Urist McVampirehammerer didn't bother with weapons. He rushed the white capital O with delight, and bit it to death. It thrashed about and broke several of his bones, but he kept on biting and biting... and killed it. He then checked into the hospital all on his own. It took him a long time to heal, but eventually a woodburner-turned-medic (one of the few uninjured dorfs) sutured him up enough, and he has been moved into a large suite of marble rooms beside the kitchens. I intend to wall him in, seeing as he doesn't need food, and he can become our broker/bookkeeper, and stay hammerer if he wishes, in a well deserved retirement.
I've seen dorfs who weren't vampires bite the enemy to death as well. It appears that the jaw is a very effective weapon.
I love how Dwarf Fortress creates epic stories.