It was during my first siege. I had already set up a couple of drawbridge, a burrow to get my dwarves to safety, and I had began to train a small army (sadly, only an handful of migrants had any fighting skills, and I didn't start with any fighters). As soon as I saw them I ordered to retreat (it went well, I only lost an hunter that stubbornly decided to face the goblins without any armor, and with lousy wood/bone bolts, so he had it coming). After a while I got bored, though (and I was also finishing the wood, so I was also pissed). I couldn't possibly wait years under siege, now, could I? I had managed to mine some adamantine, and I also created some steel, but being my first siege, I wasn't sure if my 3 recruits were up for the job, even with such fine equipment, So I first thought to lower the first bridge, and see if my traps could take down a few of them (I also had a 2 ballistas down the hallway, and I had build fortifications to close the access to the goblins if they came too close). I lower the bridge, they enter, kill my poor guard dog, then refuse to walk any closer, since I closed the access, and they couldn't path to my dwarves... So I said, "screw this"! And prepared for an assault with my 3 stooges. To help them with the goblins (there were about 20 of them) I decided to send out civilians, too, to act as a diversion, hoping this could make my "army" last any longer... I didn't expect my 3 dwarves to be effectively unstoppable, as they cut through their ranks effortlessly, ending the siege quickly... My only problem was that the civilians weren't fast runners, and ended up losing 8 of them, and at least half of them were downed by the last goblin on the map, that was sitting there without doing anything, as my dwarves blindly went toward him, ignoring his existance until he struck them down... The slow response of my army to my orders didn't help, either... In the end, I felt so stupid I abandoned the fortress, and started a new one (that had a nice cliff that went from the surface all the way down to the glowing pit, that lagged so badly I immediately had to quit that one too...)...