As an attempt to consider the causes, course, and consequences of particular conflicts that have plagued Europe throughout much of its history, historian Udo Heyn addresses several pertinent issues in his book. Following an introduction to the topic, the issues and definitions involved, the rise of the doctrine of “Just War” comprises an essay on the Western quest for peace. Clearly tied to this doctrine is the role of the medieval church in the quest for peace in Europe. This is explored through the concepts of the peace of God and the truce of God. Peace campaigns of the state are also considered in terms of the secular peace of the prince and the peace of the realm. The moves from private justice to public law and private combat to rules of war are explored. Various catalysts and additional factors in the pacification of Europe are also considered. The study ends with an extensive bibliography on the subjects under discussion, providing a gateway into further research on this important topic.