Lincsbodger said:I simply cannot see how you can have 'rules of war'.
I agree that it's a bit of a contradiction. What seems to happen is that opposing forces come to some kind of agreement on what is or isn't 'fair play'. Going back to my history O-level (failed) I remember that, during WWI, British generals initially rejected machine guns on the grounds that they were 'not gentlemanly'. Unfortunately for them, the Germans had other ideas!
The problem is a simple one: he who has the best weapons will probably win. And so we got flame throwers, poison gas, etc, etc - but if you think WWI was bad, the Boer war was far worse. Unable to defeat the Boers in a fair fight, we, who like to call ourselves civilized, rounded up civilians and starved them to death.
Something else happened during WWI; there were sporadic outbreaks of peace. Without any formal agreement, both sides avoided shelling each other at certain times of the day so that they could all have a rest. I suspect that many of the unwritten 'rules of war' grew up in this way. It's only recently that a more formal set of these 'rules' have been written down in the Geneva convention though, as Thermo points out, not everybody follows it.
Moreover, such agreements only work when both sides have similar ideas of what is and isn't acceptable. Here in Europe, we had a general agreement that prisoners should be treated humanly. This may go back to the knights' code of chivalry if not further. Over in the Far East, they didn't see it this way. Prisoners were there to be tortured to death for a laugh. My father-in-law fought in WWII and he once told me how we tried to fight the Japanese by our rules but, after a while, we got so disgusted with the little s*ds that we killed them on sight. This is an example of how war tends to drag everybody down to the lowest level.