Battania's army composition just seems weird to me. What do they specialize in? Well, their best units are archers but their armies have very few archers in total. So they end up entering the battlefield with a huge infantry blob and a very small ranged formation that lacks the numbers to deliver an impressive volley (no matter how impressive the individual archers may be).
I say TaleWorlds should add a Welsh-inspired longbowman upgrade path to Battania's main troop tree.