Tracking firm Rentrak said on Friday that director Angelina Jolie's World War II drama "Unbroken" finished first at the Christmas Day box office in its debut and edged out another new film for the holiday season, modern fairy tale musical "Into The Woods." "Unbroken," the real-life story of Olympic runner Louis Zamperini's two years as a prisoner of war in Japan, brought in $15.6 million, helping Comcast Corp.'s Universal film and Jolie's second directorial effort stand out in the crowded U.S.