Hey Spike,
To get an even more graphic view from the French side, read "Under Fire" by Henrie Barbusse, The thing that I think would be the most overpowering part of the battle field would be the smell of death, that is rotting flesh, not everyone has the opportunity to experience such an odor, but working on a ranch, one encounters it from time to time and it is overwhelming, and to add the psychological aspect of knowing that it was coming from the remains of friends would make it very difficult to bare.
Best wishes
Gus