Interestingly, this thread is the first result for "Let's Play Ogre Battle" on Google.
Instead of doing a mission today, I'm going to do something much more daunting: re-arrange my army to try to get the unis a bit more balanced out.
I'm thinking of taking Warren (who is a Lich!) and just using him to make his own unit. That'd be worth it, right? Him, Wraiths, and those ghost thingies?