無防備都市
At the start of the Second World War, Mackendrick was employed by the Minister of Information making British propaganda films. In 1942, he went to Algiers and then to Italy, working with the Psychological Warfare Division. He then shot newsreels, documentaries, made leaflets, and did radio news. In 1943, he became the director of the film unit and approved the production of Roberto Rossellini's early neorealist film, "Rome, Open City" (1945).