I'm going to be trying out something well beyond my skill level (which should be akin to a newborn learning to walk on stilts over a magma filled ravine during a hurricane of rabid seagulls). I want to know if this has been done before.
I'm essentially planning to divide my fort into two forts once I become self sufficient, trying to keep people who know each other in the same half-fort. Eventually I plan on having two almost completely autonomous (I think I used that word right) fortresses. I seek to accomplish this by creating barrows encompassing the two fortresses. I'll have my first seven dig out a small living area for both forts, and build up what the first migrant wave would require to occupy and build up the second fort. Each subsequent migrant wave would be given to the forts alternatingly.
Then, in standard dwarf fashion, I hope to build two militaries and have the forts engage in battle. This is assuming I can assign a kill order on a dwarf (something I've never had to try before). I'm not too sure how loyalty cascades work (as my forts are usually overrun by forgotten beasts and the elves), but I fully expect everyone to kill everything.
Even if that second bit is impossible to do, the first half seems like it will be producing plenty of fun. Mind you, I'm not that great of a DF player (after playing more than a year I just figured out how to use farms today, though, to be fair, it's the only basic thing I've never really done), so I'm posting this idea here to see if anyone else is willing to try it, as well as seeing if this has been tried already.
Oh, and yes, this idea was influenced by the Cold War-like situation in Syrupleaf.