[Lord Hammer]

You can recruit what basic troops are there eg: Militia, Archer etc.. along with any special sites allowing Sages, Mages etc... I think there are lots of unique units to be found. As far as the enemy, when you conquer a fortress etc. of his you get only your races troops not his. I am almost positive you cannot field an army of your opponents forces, for example if you are Undead playing against Man when you take a Fortress etc. it will become yours and have only your race available.