Quote Originally Posted by Wigferth Ironwall
... I wish there was some way to get the AI to disband. :(
You can disband for the ai by starting the game with the -ian switch, changing to the other faction, disbanding the units, change back to your faction, and continue playing. Won't stop them from doing it again, though.

It's not very satisfying, but I'll occasionally do something like that when the ai has done something really dumb with one of the other factions.