Hi again Joe, I don't know the details of Pvt Slovik's case, but I assume from the fact that you are preparing a documnetary about it that there is a good reason to believe that he was suffering from "shell shock", mental breakdown, call it what you will. I don't want to seem to be trying and teach you to suck eggs, but you may like to consider a Sassoon poem as well, "Dawn attack" with the line "Sweet Jesus make it stop" would seem to be appropriate to the mood of your subject.

Pete M