Personally, I think that we would be here forever if we were to list all of the noteworthy films which focused on WWII and it's attendant horrors; POW camps, civilian deaths, the Holocaust, etc.
I'm not sure if this was ever made into a feature film-it probably was, but I've never seen it-but
The Moon Is Down
was a fantastic novel, and a great piece of political, wartime propaganda!
"The Moon is Down" WAS made into a movie:
http://www.imdb.com/title/tt0036170/
It starred (Sir) Cedric Hardwicke as Colonel Lanser.
But unfortunately it is apparently unavailable either on VHS or DVD.
I just rented "Charlotte Grey" on your say-so..If it sucks..you can send FR $3.50 in MY name...it's not like that god-awful film with Melanie Griffith and Michale Douglas, is it?