Today's militant Christians follow an ancient ethos we can trace four thousand years to the Battle-ax culture of early Indo-Europeans. Roman Emperor Constantine, from a Germanic background, approved Christianity in AD 312, believing it promised he would be 'the Anointed' greatest emperor. His Indo-European militarism characterized northern European Christianity, through Martin Luther's and John Calvin's aggressive Protestantism, American colonization ruthlessly dispossessing Indian nations, rise of competitive capitalism, to contemporary White American Protestants fighting to make America an officially Christian nation. Taking a broad anthropological approach, Militant Christianity is a new insight into the culture of 'Christian Warriors.'