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Hmm, I didn't think about saving before the battle, maybe I should have. As for the first battle, it was designed to be challenging, so that the description would match the in-game experience. However, during testing, it turned out that by leveling up the hero, you could end up saving almost the entire army, which completely ruined my idea for this battle. Therefore, when leveling up the hero, attack and defense are increased proportionally, as well as the stats of the first enemy hero. Nevertheless, Gotau's stats can sometimes increase significantly, especially in magic and knowledge, which has happened to me as well, so you just have to replay it. Fortunately, the game doesn't do this very often, and it's just the first battle. And, by the way, sometimes even the auto-battle could win this fight.