Armok-damned Crundles!
They're hanging off the wall, and all the dorfs that don't currently have jobs are stuck, either terrified or trying to attack them.
My main militia force is making sure they can't rush in and kill everyone, but my one remaining Marksdwarf is getting some awesome practice in. For the first time, not using Bone Bolts.
No, now we're hunting with Iron.
EDIT: First 25 Bolts knocked 2.5 Crundles off. Still a ways to go, and nobody else I really want to draft to be a Marksdwarf (aside from the obvious blind guy).
Screw this, and screw the inaccuracies: I'm loading up the 6-man melee Squad with some of my Legendary Bone Crossbows, metal Bolts, and go with the spray and pray method. a quarter of the people piled up there will die of hunger by the time the lone, soon-to-be-Great Marksdwarf finishes them all off.
EDIT2: THIS IS NOT THE TIME TO TAKE A NAP, Awesome MARKSDORF GUY!
EDIT3: Not proud of it, but I used exterminate on the crundles, because there was literally no way anyone could attack them, and everyone was bunching up on the corner.....plus I think some of the folks might have been either fighting each other or getting friendly fire from some crossbow bolts, because some people's thumbs were flying off.
Anyway, the fort can actually MOVE again, as opposed to literally every free dorf crowding into 1-3 squares trying to get at the crundles hanging off the wall.