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Should be a "rough" outlining on where my entrance is located.
All ambushes/sieges/caravans spawn at the same level as my fort, and my armed forces has never had any issues dealing with the invaders. (32Champions, and tonns of marksdwarves).
What really bothers me though, is the items left on the goblins, and the time it takes to clean it all up. So far i have two stockpiles for the items the goblins leave behind, one iron, unuseable armor, weapons and shield pile next to my lava forges, and one for cloth right next to a 10'ish Z levels deep pit leading into magma. But still, with 140+ dwarves, it takes too damned long to clean away the cloth and designating all the iron to be melted... the next siege is knocking on my door before I've cleaned up from the last one. (usually my ambush patrols take care of the siege before they even show up, leading to loads of clutter at the end of the map, wich means that it takes even more time to clear it all up...
Now, I'm pumping a lot of water up from the river to my fort, to make a fancy moat+waterfall thingy. Should I also make a world-flusher? build up a huge reservoir in the mountains above my fort, and have floodgates release it upon the mountainside, hopefully flushing everything down and possibly destroying it. Or do I have to resort to magma pumping?
(I'm currently using Iron bins, so I could I dump the bins in the magma, let water down the magma pit, then dig out the iron encased in obsidian and melt it?