The Guns of August is a 1964 historical drama film directed by Stanley Kubrick. It is based on the Pulitzer Prize-winning book of the same name by Barbara Tuchman, which chronicles the events leading up to and during the first month of World War I. The film stars Robert Shaw
From Wikipedia
The Guns of August is a 1962 book centered on the first month of World War I written by Barbara W. Tuchman. After introductory chapters, Tuchman describes in great detail the opening events of the conflict. The book's focus then becomes a military history of the contestants, chiefly the great powers.