In this lively and compelling history, D.S. Chambers examines popes and cardinals over several centuries who not only preached war but also put it into practice as military leaders. Engaging and stimulating, and using references to scripture and canon law as well as a large range of historical sources, Chambers throws light on these extraordinary and paradoxical figures - men who were peaceful by vocation but contributed to the process of war with surprising directness and brutality - as well as illuminating many aspects of the political history of the Church.