Just went to see the movie, 1917. An intetesting and in your face portrayal.
When I was working for the University of Colorado Corbin Library, I was in charge or organizing and curating the Map Collection. It was s large collection of maps, old and new.
However, one map stood out beyond all the others. It was an original 1917 field map of both Allied and German trenches and gunnery emplacements. It was original and if I remember corectly, it had a few notations written upon it.
On the movie there is a point when our protagonists were asked to look at a map of the front. My map looked very similar to the one in the movie.
Also, working outside of Ganado, AZ for the Arizona State Museum, we were living in Wide Ruin Trading Post, Wide Ruin, AZ. The owner and trader of the Trading Post, had an older brother living with him at the post. He had served in WWI in the trenches. He came back from Europe with advanced shell shock (PTSD) and never recovered. He was almost childlike in his demeanor and behavior.