I was curious about what it would be like to be sieged by dwarves, since they have the sieger tag. Curiously, goblins do not, just babysnatcher, so I'm wondering what it actually does.
Anyway, I just added civ_controllable to goblins and genned a world. I haven't embarked yet, but it's pretty nuts. There were two goblin civs and two dwarven civs. First, a dwarven civ (The Rag of Orders) conquered a couple of elven sites, and took over their two retreats. Then, a goblin civ (The Plagues of Esteeming) conquered the Rags' original mountainhome. Then the other dwarven civ (The Crypts of Craft) conquered the goblin infested mountainhome and claimed it, then steamrolled into the Plagues' starting tower and conquered it too. Meanwhile, the other goblin civ (The Lone Ghoul) slaughtered one of the retreats belonging to the Rags.
That was all in the first 40 years of the world. Gen stopped at 128, and they're all still at war. The Plagues have no sites listed, but I can still embark with them. The real kicker is the Rags - their only site is the once elven retreat they still own.
The goblins are listed as at war with Dwarves, ----- with elves and humans, and they have No Trade because they have no traders. I'm too in love with the screwy setup to ditch the world and change that.
Now I jsut have to decide if I want to carve a proper mountainhome for the Rags, finish them off with a goblin adventurer, or rebuild the shattered Plagues of Esteeming, constantly under siege by all other races with no resupply.