I was just playing a game as England on VH/VH, with all battles on auto-resolve. It was going ok but then around turn 50, by which time I had taken Bruge, Antwerp, and most of France except Dijon, Marseilles, Toulouse, it started getting horribly nasty. I had two Danish stacks heading for Antwerp, a full French stack heading for Angers, and hordes of Milanese spewing up from Dijon towards Rheims and Paris. And the Portuguese are dominant in Iberia and sending a stack to Bordeaux. If I fought the battles on screen it wouldnt be a problem, but with auto-resolve all victories are Pyrhhic unless you have 3:1 or better odds. I gave up as I didnt fancy the headache - right now i'm trying to play a campaign that lasts more than 150 turns so i can fight the Timurids and go see the New World. But I think I'd lose even if I tried with this one. So if your game is too easy just auto-resolve a string of battles to ruin your armies.