Since we are on the subject of questions asked by children, I can remember one conversation with my son (at that time I think he was about 5).
When I was telling him about many friends who were killed in action he asked me if they knew how to fight Germans. I told him that of course, they were good soldiers, who knew how to fight and yet they were killed. "Were you a good soldier, Daddy?" -he asked me. "Yes, I think, I was a good soldier" - I responded. "So, how come you were not killed?" he asked me...