That is an excellent question, and pretty similar to what I'm running into with putting them in WWII POW camps.
Dira's stories assume they have pretty good 'heat suppressants", and isolation chambers that can mostly block out the pack-sense, enough to keep a bitch in heat from disturbing the rest of the wolves unduly. But it's hard to imagine they'd have that technology back in the World Wars, you know? Also Dira's stories are mostly set among special ops teams, who are mostly working in vaguely wolfpack-sized groups anyway; it really doesn't make sense for infantry units which might have thousands of men in close quarters to have wolves at all. But it's a lot more fun if they do...
I've been assuming that, without the techonological aids, they mostly went for physical isolation - when a wolfsister starts showing signs, she and her brother would be moved away from the front lines whenever possible, far enough back to isolate her from the pack whether there was going to be a breeding or not. And when not possible, they... make do. In whatever way they have to. Depending on how much you want to torment your characters.
Though you could also say that it's very rare for a wolfsister in an active combat situation to go into heat at all; most mammals, like humans, will skip or delay estrus cycles in situations of high stress, poor living conditions, severe crowding, and/or short rations - also female wolves don't reach maturity until about their second year, so sisters newly bonded for American soldiers in WWI probably wouldn't have gone into heat for the first time until the war was over. But then we get back into biological reality pointing out how silly the whole conceit is.
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Dira's stories assume they have pretty good 'heat suppressants", and isolation chambers that can mostly block out the pack-sense, enough to keep a bitch in heat from disturbing the rest of the wolves unduly. But it's hard to imagine they'd have that technology back in the World Wars, you know? Also Dira's stories are mostly set among special ops teams, who are mostly working in vaguely wolfpack-sized groups anyway; it really doesn't make sense for infantry units which might have thousands of men in close quarters to have wolves at all. But it's a lot more fun if they do...
I've been assuming that, without the techonological aids, they mostly went for physical isolation - when a wolfsister starts showing signs, she and her brother would be moved away from the front lines whenever possible, far enough back to isolate her from the pack whether there was going to be a breeding or not. And when not possible, they... make do. In whatever way they have to. Depending on how much you want to torment your characters.
Though you could also say that it's very rare for a wolfsister in an active combat situation to go into heat at all; most mammals, like humans, will skip or delay estrus cycles in situations of high stress, poor living conditions, severe crowding, and/or short rations - also female wolves don't reach maturity until about their second year, so sisters newly bonded for American soldiers in WWI probably wouldn't have gone into heat for the first time until the war was over. But then we get back into biological reality pointing out how silly the whole conceit is.