"Powstanie Warszawskie" (the Warsaw Uprising)
which is a movie made out entirely out of historical footage of the warsaw uprising. While the story is most certainly not the most fascinating one, this movie was absolutely terrifying. The footage has been digitally improved and colourised(is that a word? it should be a word), which made it way more "real" to watch than some tv documentary with bored lector reciting the amount of dead.
Also- it was fucking terrifying, showing war at it's scariest- very few 'action' scenes(which were actual shootouts, to remind you), shots were mostly of the ruined city, people living and dying.
I'd call it the most anti-war movie ever, showing how cruel and pointles war is.
Sorry for the lack of english subtitles in the video, but i cant find any:P