The 3rd recipent of the honorable Best Picture prize, "Western Front" is easily one of the greatest movies I have ever seen, and not just about war! It shows you the graphic, painful truth, and how very young people are going into the Army and dying within their first few days; they enlisted because they thought it would be "fun." Not just for movie buffs, but for every(mature) teenager and up!
Quite violent, but that's the point. It shaped my views of war a lot. Basically, the point of the movie is that war is hell. You should definitely watch it. I saw it when I was twelve.