Today, the Furnace of Executioners was in...
The Shadow of the Bronze Colossus
OK, that joke's probably been done before, but still. Specifically, I was attacked by Vacathi Clawdented the Punches of Biting. Right...
So, my military was 39-dwarves strong, but mostly armed with spears and war hammers. There was a dabbling of swords, axes, and one platinum mace that did nothing, but that was it. The Platinum mace wielder put up a spectacular fight for a while, she landed 20-some blows with her mace in-between every attack the Colossus made (half of the time, they were even strikes from behind!) But, everyone of those heavy hits merely glanced away and she was eventually beat to unconsciousness. Fortunately, there were dwarves to draw the colossus's attention away. The entire military got in on it, plus some pet cats and dog! An endless flood of poorly armed and equipped dwarves washed over the colossus, denting him on occasion with silver war-hammers and steel spears.
When the head finally came off, I imagine the colossus must have looked like tinfoil wadded into the shape of a man. While a few sustained injuries, only two actually died. The Platinum mace wielder, and creator no less, had to go to the hospital. Yet, not a single dwarf came to rescue her. She eventually woke and walked there herself on her two mangled upper/lower legs and mangled left-right hips. I'm vaguely considering renaming her Urist McCrazyLegs.
Updated! I got my first Forgotten Beast (ever!) It was a giant, fire-breathing, eye-lidless, trunked Raven. Suitable to it's form, I though my Fortress was 'nevermore! Ah, but waiting for it at the top of the stairs was my crack military squads. The Dwarves bum rushed it, and with more room to fight, had it surrounded several times over before the merciless mangling began! It was over quickly and had only the change to breath fire once: on a brewer who dodged it as if his stills did it all the time.
Update 2: Another Forgotten Beast already? An Eyeless, croaking, Moth with 4 short horns, and a rough 'n cracked, pine green exoskeleton, that breaths fire? Really? Well it's in part of the resealed caverns so I'm not going to bother with it.