The Marquise of O (1976)

During the attack on an Italian town by Russian forces, the Marquise of O., the daughter of the colonel in charge of the defence, is attacked by a group of Russian soldiers. A Russian Count comes to her rescue, and falls in love with her. While he is away, she discovers that she is pregnant, though she cannot explain how that happened. Her father repudiates her, and she has to reject the Count while trying to find out who the father of her child is.