Sahara (1943) starring Humphrey Bogart, Bruce Bennett,  J. Carrol Naish,  Lloyd Bridges

Sahara is, in short, an excellent movie — €” set in World War II, in the desert conflict, it involves a ragtag multi-national group of Allied soldiers (Humphrey Bogart, Bruce Bennett, Lloyd Bridges) as well as their Italian prisoner of war (played memorably by J. Carrol Naish) who come upon an oasis in the desert — €” a crumbling ruin.

The ruin has a cistern — €” not a well, but a storage place for water, that’s nearly dry. The GI’s no sooner find it than they’re surrounded by Nazi soldiers, who are dying of thirst — €” but are armed to the teeth.