19. All Quiet on the Western Front
This movie is freaking remarkable. It is one of the best depictions of the wide gap between the perception of war and the reality of it, what war actually does to its participants. If you see only one WWI movie, this should be it.
20. Ikiru
Kurosawa is one of the best film directors of all time, and this is the one I keep coming back to whenever I think of him. It's relatively minor, but its quiet humanism is simply lovely and affirming.