(WAAF). In her account of the work of photo reconnaissance Evidence in Camera Constance Babington Smith records that she was with them and worked closely on the interpretation of photographs for the 1942 invasion of North Africa, Operation Torch. Known by the name Sarah Oliver, Babington Smith says she was "a quick and versatile interpreter." Aspects of Churchill's wartime service are also described in detail in Women of Intelligence: Winning the Second World War with Air Photos. American author Christopher Ogden's biography of Pamela Harriman and other sources indicate that during the war she had an affair with (married) US Ambassador John Gilbert Winant, and that it ended badly. Winant committed suicide in 1947. Catherine Grace Katz's book, The daughters of Yalta: The Churchills, Roosevelts, and Harrimans: A Story of Family, Love, and War describes Sarah, Kathleen Harriman and Anna Roosevelt Halsted, playing a key role in the Yalta conference, as they managed their temperamental fathers. Acting career Churchill is best known for her role in the film Royal Wedding (1951) as Anne Ashmond, romantic interest of Fred Astaire as Tom Bowen. In the same year, she had her own television show. She also appeared in He Found a Star (1941), Spring Meeting (1941), All Over the Town (1949), Fabian of the Yard (1954) and Serious Charge (1959). On 17 November 1950, Churchill starred in "Witness for the Prosecution", an episode of the American TV program Danger. She appeared on both the Jack Benny radio and television programmes. On television, she appeared on the episode "How Jack Met Rochester". In 1960, she appeared as Lisa Grayson in the play "The Night Life of a Virile Potato" by Gloria Russell at the Lyric Theatre, Hammersmith, London. In 1961, she appeared as Rosalind in Shakespeare's As You Like It at the Pembroke-in-the-round Theatre in West Croydon. Her parents were noted as paying a surprise visit to watch her performance, which was almost entirely attended by Croydon schoolchildren. Her father, who sat in the front row of an in-the-round performance and so was highly visible throughout, fell asleep. Prints During the course of her life she created several lithographic prints. In the 1950s Churchill produced several prints featuring Malibu, California. Later in the 1970s, Churchill commercially published a collaborative series of portraits of her father, Sir Winston Churchill through Curtis Hooper, entitled "A Visual Philosophy of Sir Winston Churchill". The series was carefully