Georg Wilhelm Pabst's movie on the war in the trenches was published the same year as All Quiet on the Western Front (director Lewis Milestone) - like the latter one, Westfront 1918, also belongs in my opinion to the best movies made on the subject of WWI. I like All Quiet more, but without any doubt, if you are interested in (anti)war movies, and especially in WWI, Westfront 1918 belongs on your watch list.
Review of Westfront 1918
