yasnikov
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In my opinion, the only difficulty in this mission is that the enemy has too many heroes and they push from all sides, so you don't know who to chase and waste time because of it. As a solution to this problem—buy secondary heroes in captured Castles (especially since high-level ones often appear) and leave them with enough troops to defend cities and retake mines, while using your main heroes to traverse the map (preferably in different directions to cover as much territory as possible). For example, I had no problems capturing cities, nor during open field battles (both against warlocks and demons). I captured the first 6 Castles here quite quickly and easily (though I did have to retake them a couple of times), while I intentionally didn't capture the last one in order to level up as much as possible. By the way, do you know that in this mission there is a land-based (and quite extensive) territory packed with various goodies?