Infantry Relief System

[Mark Hygate]

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It would seem much more, dare I say, logical, that unit relief would occur when one of the "waves" was pushed back and the enemy regrouping?

To be fair, had it been done (and I'm on the side that it's both perfectly practicable and sensible to do so if possible), I don't think anyone's been arguing that it wouldn't be done in a 'lull' and not in continuing hand-to-hand combat. So yes - 'when the wave retreats before the next one'.