Bay 12 Games Forum

Let's go!
(ohmygod your avatar cycles ;-;
why must you do this)

Or, you could use the water shotgun idea, but like this:
.=empty space
^=ramps/stairs
F=fortification
W=divot w/ water
-=minecart track
C=minecart
_=floor
                      ^
              ___   .
 --W-.CF ___    .
             ___    .
                      ^
The minecart picks up the water (or magma for more Fun) and launches out of the fortification. Then said water (or magma) pushes enemies into the empty space, and down onto some +=-menacing steel spikes-=+ or whatever. Maybe some more magma? (Not recommended in close proximity to dwarves due to magma mist)

Signed up just to post this:
I embarked with a river, and said river suddenly led to empty space; a waterfall.
"Wonder how tall it i- ohmygosh."
It's a 6 z-level drop.
Fun will surely ensue.