There are many war related documentaries and some of them are very nice helping the viewer to learn a lot of things about history. Of course most of us have learned facts form history books yet it's more fascinating to watch them with nice footage.
I will recommend the ''Apocalypse'' which is a French production. I paste below the description from the DVD:
''As broadcast on Channel 4, Apocalypse is the groundbreaking documentary series that tells the brutal and moving history of World War 2 entirely through colourised archive footage.
Three years in the making and gathered from more than 60 national libraries and personal archives, Apocalypse tells in amazing, never-before-seen detail, the key events that shaped the conflict: from the Blitzkrieg to the Allied bombing of Berlin and Stalingrad, through to the dropping of the Atomic Bomb on Hiroshima.
In six one-hour episodes, prepare to experience first-hand how nations were saved, whole armies lost and heroes made.''