I watched this one last night. I hadn't seen it since the 1980s.
Lee Marvin is the main star, but Ernest Borgnine, Charles Bronson, George Kennedy, Telly Savalas, Jim Brown, and Donald Sutherland, along with a number of other stars are in the cast.
It tells the story of a group of convicted soldiers, many of them awaiting execution, that are given a reprieve to participate in a covert mission behind enemy lines. The interaction between the stars, the role played by Lee Marvin, and the mission they undertake come together to make a classic movie that is better than the sum of it's parts.
What they do to the Nazis at the climax is as over the top as anything Tarantino could come up with.
This is the official trailer. It is so 1960s it looks contrived.