Fireball
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The battle isn't that difficult. The hero has 10 attack points, so on the first turn, you need to rely on luck with the peasants, and then use weaker units as bait and lure out the hydras and minotaurs at the right time. I still advise you to play it yourself. If something doesn't work out, I'll provide a round-by-round description, which VDV_forever sent along with the save file.