Again, in theory it's a great idea and I'm all for it. However, I don't know how likely it would be that whoever is playing the game can pull it off. If the legion is in a battle zone somewhere and after a battle, losses are incurred, it wouldn't make sense to withdraw the entire legion to a city where all the units can be retrained, then brought back taking a lot of time. There might be the need to fight other armies in the area before retraining, or even on the way to back to retraining. However, if the general idea is kept a bit more loose, and we can simply retrain units only for this legion, but not necessarily before every battle, then it should be fine but it'd lose some of it's point. In any case, I'm for it if a conclusion is reached as to how to manage it.