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I have no doubt that tactics is the most valuable skill in the game. I won't repeat what has already been said about tactics, but I would like to note one thing: only with tactics can wizards defeat a Fortress, and there is no other way.
In turn, I will say that tactics are not a necessary skill for a wizard, especially for a basic or a well-developed character. NOT NECESSARY. Arranging troops to take a Fortress with a wizard is, in my opinion, nonsense. A Ballista is even more useful, although I rarely take it as a skill.