Yep, channel. I may post some screens of my super fortress later which is totally siege proof, and can defeat any siege, even super mobs.
Early game, long coridors for your entrance (above or below ground) loaded with stonefall traps is your friend (chained guard dogs are good too to catch ambushers/thieves).
Also another tip, trade wagons need 3 tile wide paths to get anywhere, and can go up and down ramps as long as they are 3 tiles wide. This is useful to know for getting them underground if you have dug down into the ground rather than into the side of a mountain.
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