I've always been curious, are there any practical size limits on how many divisions you can have in an army? (I.E. if having too many divisions in a single army will cripple their fighting ability or something). I always lump my land divisions into groups of 3 and my naval flotillas into groups of 10 or so just to be on the safe side, but it'd be nice to know if the option to create a super-sized army is practical.