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If we're talking about Heroes of Might and Magic V, then the ballista is important, especially in the late game. My friend and I were playing (I was playing as Elves, and he was playing as Dwarves – and he was quite the cheater), and I was really annoyed by his ballista. He upgraded it, it moved frequently, shot powerfully, and its contribution to victory was significant. Although, I also made a mistake there; I should have taken it out right away, but the fact remains. I learned that lesson.