A few years ago I saw The Bad Seed (1956) which has now become a favorite of mine around Halloween time.
While doing some internet searching on the film, I learned about the author of the book it is based on, William March. He died the same year the The Bad Seed was published which went on to become a successful stage play and later film.
But before all that, he was a soldier in World War I and wrote a book based on that experience called Company K (1933). It is a strange book, a collection of 113 short chapters (many just a page or two) that describe some aspect of military life and war – the joy, the mundane, the absurd, the terrifying.
It strikes me as before its time, but also, of course, timeless.