This movie tells an historic story, and begins with a somewhat arty slant. But it gradually becomes a dadaist study in human depravity and thinly veiled injustice in terrible times. Though set in WWII, it is not a war movie. It probes deeply and uncomfortably into moral issues rarely discussed in war movies. For this reason it is extremely compelling.
The plot line is not direct, and the characters often confusing, but that is it's goal to be a moving piece of cinematic art. The film develops into a Felliniesque dream where logic and a pleasant, easy, normal straightforward narrative dissolve into a a gaudy abstract symbolism that will require a second viewing to figure out. This film is on the level of Bergman, Fellini, Godard etc. It is a challenging, heartfelt film, not suitable for date night. The direction, camera, acting, editing, sets, wardrobe, casting, are excellent.
I watched this in 2020-- 12 years after it was released on the Criterion Channel. Never had heard of it, but the description sounded interesting. Interesting, the language is Italian with English subtitles, even though many of the characters are American (including Burt Lancaster) who was ironically typecast as the dithering, bullying American general (referring to Buck Turgidson in DR STRANGELOVE).
I couldn't find any professional reviews of this film, or any box office history, so, because of its ambivalent anti-war/anti-Americanism it may never have played theatrically in the US. The Criterion Channel may be the only place you'll find it. But if you love cinema, you'll love this film.