I know this is a really broad question that wont answer many things due to many many reasons, but I am still quite buffled to see what was the k/d ratio of the average soldier per army, I understand that due to the nature of the war and how it changed who defended/attacked and the country's manpower, so what i am asking for wont really answer many of my questions but I am still interested to see how efficient (on this aspect) each nations army were. Any suggestions on where to begin?