Quote Originally Posted by zooeyglass
Obviously the military setup for most (if not all - haven't played as every faction) is that there are two sets of buildings - foreign recruitment and home recruitment, as it were. The latter is for getting the historical factional units, and the former for bringing in regional units, especially if you've journeyed further afield. Right so far?
It's quite easy (in concept, not in doing so!) that you can recruit any unit only where the recruits historicaly came from, and can recruit only units that were either part of the historical army of that faction or would have been if she had made it this far. Example, no Hellenic faction has ever conquered Britannia, but in EB that might happen.

What I've been wondering about is what should be done with the military buildings of other factions once you conquer a province? Simply destroyed?
Yes.

or do they need to be kept if you wish to bring in regional units, or some such?
No. You have to build your own regional barracks in order to do so. What can be build where is determined by the local governement that you have build.