Stalingrad (1993) is pretty durn depressing. Attack and Retreat (1964) is the Italian side of it.
I actually have Stalingrad. It is an excellent movie.
"Cross of Iron" was a good but flawed movie. Had real production and money problems so it didn't end up being the movie Peckinpah wanted it to be. The movie ran out of money and Peckinpah was forced to wing the ending in one hurried take with improvisation. That is why the ending is a little odd and not like the book's ending at all. The book, by the way, is an excellent read. -- Al