The lost puppies return home when time comes, but it's also harder for these puppies to meld together with their companions easily, nor would their range of activity be higher.
This is what pushed me to abandon the prior idea, instead, I did something much simpler. "I apologize for the inconvenience," I say while killing a soldier who was just trying to relieve himself during the night. Followed by a bit of memory reading and taking his place.
This might sound simple, but with mages actively keeping a watch over the camp, things were much harder than one can imagine.
Hell, I was forced to make two of them take a simple nap of just ten seconds so that they don't notice any oddity. Which was enough time for me to act.