Carlo already said some really good, especially the series "Generation War" is really good. (the German title is "Unsere Mütter, unsere Väter" by the way)
Der Untergang would also be a possibility
if you don't care about age then I would say "Die Brücke"(1959) and if you do care about age then there is a remake "Die Brücke"(2008), the remake is not as good, but still quite enjoyable.
Sophie Scholl – The Final Days (Sophie Scholl - Die letzten Tage)
And there is pretty much every Hollywood WW2 movies also avaiable in German.