The Battle Cry of Peace is a 1915 American silent film war drama directed by Wilfrid North and J. Stuart Blackton, one of the founders of Vitagraph Company of America who also wrote the scenario. The film is based on the book “Defenseless America,” by Hudson Maxim, and was distributed by V-L-S-E, Incorporated. The film stars Charles Richman, L. Rogers Lytton, and James W. Morrison. Alternate titles for this film were A Call to Arms and The Battle Cry of War. In the UK, the film was called An American Home. A sequel followed in 1917, Womanhood, the Glory of the Nation.
While the majority of the film is now considered lost, the Cinemateket-Svenska Filminstitutet possesses one reel and fragments of footage of battle scenes survive and are housed at the George Eastman House. Upon its release, the film generated a controversy rivaling that of The Birth of a Nation because it was considered to be militaristic propaganda. Producer J. Stuart Blackton believed that the US should join the Allies involved in World War I overseas, and that was why he made the film. Former President Theodore Roosevelt was one of the film's staunchest supporters, and he persuaded Gen. Leonard Wood to lend Blackton an entire regiment of Marines to use as extras. In the same year, Blackton published the book version of The Battle Cry of Peace with pictures from the film version. The book has nothing to do with “Defenseless America” by Hudson Maxim.