Wonderful, sweeping film that shows the sad, horrifying progress of war in the first half of the twentieth century. Up there with Brideshead Revisited in the great works of art that ennoble nostalgia (not a popular thing to do these days, I know).
Also, one of the weirdest origins for a great movie I've ever seen. It's based on a one-panel British comic strip that satirized the military and especially the old guard officers who could not keep up with the times--like, imagine if someone made a sweeping epic of the gradual degradation of the American military from WWII to Vietnam and named it Beetle Bailey, and had the main character look and act like General Halftrack. That's basically what this movie does, successfully, no less!