The Longest Day (1961), on TCM as part of their “31 Days of Oscar”…every film they’re showing in March was Oscar-nominated.
It’s the story of D-Day, from both allied and German side, shot in a style usually called “earnest”, “stolid”, and “quasi-documentary”. Virtually no effort is made on characterization; it’s just this happened, then this happened, with lots of worrying on both sides followed by shooting and explosions. (The same film-making approach as was taken a decade later in Tora! Tora! Tora!)
The bottom line: allied bad luck (e.g., paratroopers badly missing their landing zones) offset by German blundering (not recognizing that the invasion was not a diversion; not deploying panzer reserves) and Allied heroism.
The noteworthy thing about this film is that every male Hollywood star was in it. Mostly as walk-ons; a star will appear, read a few lines, and not be seen again. According to Ben Mankiewicz’s intro, this was Darryl F. Zanuck’s doing: he devoted massive resources to juggling schedules of the stars.
Most of the officers (on both sides) are Real People; you can tell they’re Real because when they appear, text appears on the screen giving their name, rank, and unit. John Wayne and Robert Mitchum have fairly meaty roles; but we also see Robert Ryan, Sterling Hayden, Edwin O’Brien, Peter Lawford, Richard Burton, Henry Fonda (as Teddy Roosevelt Jr), Eddie Albert; plus every German-speaking actor in the world.
Enlisted men are not Real People but a (mostly unsuccessful) attempt to provide relatable characters. These include Richard Beymer (in the only role I’ve ever seen him in outside West Side Story), Sean Connery (as an Irishman…close enough
) Red Buttons, Sal Mineo, and several teen idols of the time: Paul Anka, Tommy Sands, Fabian. On the German side there’s Gert Fröbe, in the only role I’ve seen him in besides Goldfinger.
It’s very long, and flawed as noted…but it’s pretty compelling and nicely shot (oscar winner for b&w cinematography). And it ends with a song over the closing credits, sung by the Mitch Miller Singers. I kid you not.
As is typical for films of that era and earlier … it’s a completely sanitized and bloodless war. A character fires a gun, and another character throws up his arms and falls over silently and neatly. There is no blood, no guts, no body parts, no screaming (c.f. Saving Private Ryan).