So, I'm looking into creating a world war 1 all flesh scenario based around the second battle of ypres, which was the first large scale use of lethal gas in the war. What I'm looking for is something that would explain the nitty gritty of life in the trenches, food, water, soldiering kit, gear all that wonderful stuff. It seems like the kind of thing that would be front and center in an rpg sourcebook but I can't find any. I know there are a lot of scenarios written for call of cthulhu that take place in the 1910's and 20's, would any of those be any help?
Anything is appreciated, thanks.