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I don't understand, who's slowing down?:confused: If it's a hero, the enemy won't go anywhere; in any case, you'll always have time to capture the castle, so the opponent will have to fight to retake it.
P.S. IMHO, speed is important, but not more important than the army.
And the strength of the army isn't the most important thing; the AI always has a larger army; it all depends on the strategy and parameters.