A movie that just wiped me out was "The Bridge" (1959). It's about the end of WWII in Germany. The Allies are advancing deep into Germany, and a group of Hitler Youth are sent to hold "at all cost" a bridge. The US troops know they are 13-14 year old kids, but they are under orders to take the bridge ASAP. The troops try to get the kids to give up, but they won't .Even though they are kids, they are heavily armed and shooting. The troops have no choice but to wipe out the kids.
What made it so real was that it was all in German, with subtitles. It's an anti war flick..