How did the Romans swap units around mid-battle?

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How did the Romans replace hard-pressed units with fresh troops during battles? The theories on this are legion.

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Here I exercise my right to speculate about how Romans swapped maniples from the second line (principes) with units of the first line (hastati) during a hard-fought battle. I am confident that no one knows how it was done, so we can all give it a go.

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