I think you would also see children being employed in observations roles as well, (not spying per se, but definitely surveillance and not messengers as such but that's also part of it). Think of the kids sitting on the hill and watching troop movements in the movie Black Hawk Down. All you need them to do is watch an area and report anything suspicious or "interesting".
And not just as lookouts but also keeping an eye out for say, refugees, or merchants either to set them up for banditry or to encourage them to come to the camp (or to keep away).
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