I want to add my "two cents."
Based on my experience with the previous map, I immediately started with the "recruit" setting. And what do I see? The difficulty level of some battles is quite comparable, if not to "Hero," then definitely to "Veteran." And it's impossible to replenish the army... It's impossible to break through to the mentor without fatal losses, and there's nothing to randomly replenish with. Starting over and replaying to get the right hero settings is a tedious maze, even with a known path.
It's a shame – it's a beautiful map, an excellent story, and extremely interesting scripts – and you can only play it with a LOT of stress.
Please understand, I'm not a hardcore player; I have plenty of things in life that challenge my brain and nerves; I expect relaxation from a game. That's why the game has different difficulty levels, taking into account this division of players.
Okay, I'll look for another 5th vampire unit and try to play on.