I have built my fortress in Dwarf fortress with the entrance on the side of a mountain. About 8-10 levels up is the peak of the mountain, upon which I have built an archer tower. My question is how effective this is going to be for picking off invaders outside my fortress... are archers able to shoot that far, and with reasonable accuracy?
Here's a quick little side-view sketch of what my scenario is:
|____|_ <- tower / \_ | \__ / \ | fortress __\_ / here _____________________ / \_ / \_______