Western Christianity (Catholicism and the plural Protestantismus) has influenced the forms that war, maryrdom, and terror have taken over centuries in Europe and in the United States. It has shaped (as opposed to caused) these kinds of violence even across the putative divide, created by secularization, between premodernity and modernity. One observes thus in the very longue durée of the history of the West recurring constellations of notions and practices, borne sometimes by the State, at other times by smaller militant groups.