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I played through the map again. Now it's significantly better. But I have a question. Is it necessary to dismiss all heroes before the last turn? Because in my case, the last battle was won by a supporting hero.
I don't think it's necessary ;)
P.S. Maybe I should play it again for the second time and improve this unfavorable result :)
Ah, if only the army could be split...
Sincerely, VDV_forever