The Fog of War, also known as The Fog of War: Eleven Lessons from the Life of Robert S. McNamara is a 2003 American documentary film about the life and times of former U.S. Secretary of Defense Robert S. McNamara. The film was directed by Errol Morris and the original score is by Philip Glass. The title is related to the military phrase "Fog of War", describing the difficulty of making decisions in the midst of conflict.