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Don't you see? That's the beauty of Heroes of Might and Magic IV: you have a choice.
After all, instead of building a Ballista, you can build Pikemen, which will give the army completeness and mobility, and most importantly, balance between archers and warriors!
Why not?

Как много в жизни есть путей
Для добродетелей и мира.
Я вернулся...