Part six tells of Oliver returning to duty sick and depressed. He was "thin, sallow, and tired" and "he couldn't sleep well at night, and seemed to be half asleep and dreaming all day." His commanding officers realize that his depression has made him unfit for service, and send him to a nursing home. While there he realizes that he is not free, and makes the decision to marry. Recall that Peter's life was wrought by similar circumstances, but realized a different outcome.