Wars attributed to sanctity have an endless history. It continues today, when Islamic fundamentalists are still convinced that their inhuman terrorism is "holy war" (jihad) in the name of Allah. Calls for jihad are often heard from today’s radical Islamists, while many Americans believe in a divine mission for the U.S. military—but the trail of war waged in God's name reaches back over 1,000 years. This series traces the Crusades, the spread of Islam, and the wars of the Christian Reformation.