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That is my thinking on the matter too. I would thaink that, historically, when armies were first mustered it was at the behest of the local or Nation’s leaders. They wouldn’t bother, in my opinion, about such niceties, and more than likely people served until they died or, until the reason for their enlistment was past.
Then I would imagine they were simply disbanded until required again bar a nucleus which would be retained for emergencies.
Aut cursu, aut cominus armis