That sounds like a significant part of your past that has helped shape the person you are today. If you want to be intimate with this girl and establish a very close relationship its probably important for you to be able to share this with her. You may want to hold off until you already establish some of that intimacy first because this is the type of thing that could easily scare someone away.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.