Canada, wartime conduct, and Geneva folklore

Would improvised Home Guard tactics have been treated as Geneva Convention violations, and which Allied force generated the most such folklore?

Modern war-crime law was formalized relatively recently, and Canada is jokingly identified as the Allied force most associated with stories of rules being written afterward.

The answer first notes that modern war-crime categories were articulated comparatively recently. Canada is then jokingly identified as the Allied country most associated with stories of conduct that later lawyers would have to address, with New Zealand offered as another candidate. The exchange is military folklore and humor rather than a documented ranking of Allied violations. It distinguishes violence in wartime, the legal language available at the time, and retrospective stories about why later rules exist.