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No, that's true, but a more frequent use case will be attacking neutral creatures. Here's the situation: the main hero wants to capture a castle. For example, to learn new spells. It takes a long time, and the pace is lost. But there's a weak unit nearby. What to do? The army is given to the weak unit, the hero attacks the nearest neutral creature and runs away. Then, the hero is bought back in the tavern, and the game continues.