The Geneva Convention not only outlines the treatment of POW's. It also outlines generalized rules of conduct for warfare. For example: It is a violation of the Geneva Convention to use large caliber (like the HB Browning 50 caliber machine gun) against personell directly (putting a bunch holes in a truck to stop it, and a passenger gets hit in the process, would be completely acceptable). In other words it's Rules for Warfare, where all countries who officially accept the strictures are expected to abide by them, else the violatersa will face a trial in a UN Court of Law. However those countries who don't officially accept the strictures can pretty much get away with what they want.
I don't imagine Sauron or Morgoth would have paid any attention to any such rules, let alone even bother considering any such thing once they had openly declared themselves.
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