This is a brilliant film, I watched it as a young teenager and can still remember the gist of it (and the futility of war).
Also, nobody mentioned The Longest Day. I haven't seen that in a long time, but it is a classic and shouldn't be left out. D-Day.
Can anybody give any WW1 films? There have been a fair few, very poigniant as well. Just can't think of any off the top of my head.
Oh, also another classic, about the commando/intelligence raid to destroy the Norweigian-based facility the Nazis used to create 'heavy water'.. Can't recall the name... Any ideas folks?