First an explanation of my fort:
My most recent fort is a little family fort where I made a bit of iron armor and got all the starter dwarves killed fighting off the demons (they actually won, though) after the metalsmith & wife arrived. Years passed, and I have a few nobles now (broker, bookkeeper, dungeonmaster), the econony started (even though I killed the manager as soon as he came, too bad you can't turn that off - I had to have the broker to chasm and melt things), and the couple's many children have begun growing up.
Just to try something new, I also made it so that horses dropped adamantine (cheating, yes, but I would disable the demon and mine the stuff if I could - I was getting bored of just steel, and I want to see if I can get adamantine artifacts) and have been breeding them to make things. So far, I made 3 sets of full adamantine plate, crossbows, and some bolts. My first 3 children to grow up were given these and trained, first in wrestling and then in crossbows.
So now in the spring of 1067 my first siege happens, and 24 goblins show up on the map. At first I think that I will probably have to just burn them up in magma, but I decide to try my 3 marksdwarves out (who are at expert, professional, and accomplished levels now). So I send them down to the enterance to my fort, and position them in a line a bit into my 3 tile hallway. Each of them are carrying 10 adamantine bolts.
So after a few minutes, the goblins make their way to the fortress, come in the doors, and start making their way down the hall in 3 lines of 8.
They take a few steps, approach the dwarves, and then they are in firing range - the 3 dwarves start firing off the 30 bolts as the goblins start to charge. The bolts fly down the hallway and in a couple seconds every single goblin is dead, 24 goblins piled onto eachother across the hallway, and a few extra bolts fly past them hitting the ground behind them. The dwarves never moved from their posts, and none of them have any wounds at all. No messy limbs to clean up either, just 24 neatly piled goblin bodies.
I wish I would have made a video, or at least taken a screenshot of the aftermath, but by the time I thought of it I had already moved the bodies to the refuse piles.
I can't wait for something big to show up, I wonder how many adamantine bolts it would take to pincushion a dragon...