Well that's no fun.
Now your military wont have anything to kill.
He'll have fun if he forgets to restrict his burrows before a goblin ambush sets off all the traps. 
On a constructive note, how many people here use stonefall traps? I imagine most people are sticking to the tried-and-true 10x steel serrated disc weapon traps, but stone is ever so plentiful.
I've used them a few times, they are very effective for the price(two worthless stones and a minute or two for mechanism creation, building the trap, and loading it per trap tops), however Later on once you are hauling constantly just to keep your place cleaned up it really slows everything down having to load them over and over. Most of the stones in the traps survive to be used again, but it's still just too much additional work unless you've found a way to work in 80+ hauler/mason/mechanics at once. Once I upgrade my PDC i may give it a shot, but that's a while away still, my population cap is set at 110 for now. Gives me about 60 haulers overall.
Anyway, as far as effectiveness goes, anything not wearing armor(war animals, trolls, etc.) might survive 4 traps tops, generally less before being knocked unconscious or killed. The rocks are like extremely heavy hammers with terrible accuracy basically, each one could in theory jam skull through brain but most often breaks several bones and scare away or bleeds to death stuff. More or less you're taking quantity over quality. One weapon trap with various serrated discs or former invader weapons will dismember or kill multiple invaders before being jammed with corpses or running out of ammo, however it will take several stonefall traps to kill just one invader, generally.
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Topic: Overkill trap numbers + some other stuff (Read 7553 times)