The Grand Maneuver

A French lieutenant makes a bet that he can seduce any woman in town in the two weeks before his regiment leaves for maneuvers, but his chosen target (a Parisian divorcée) isn't like other girls he's known.

The Grand Maneuver is a 1956 drama romance movie directed by René Clair, starring Gérard Philipe, Michèle Morgan, Jean Desailly. It holds an IMDb rating of 6.7/10 from 1,250 votes and runs 1h 46m.