This volume brings together some of Professor Azar Gat’s most significant articles on the evolution of strategic doctrines and the transformation of war during the 20th and early 21st centuries. It sheds new light on the rise of the German Panzer arm and the doctrine of Blitzkrieg between the two world wars; explores the factors behind the formation of strategic policy and military doctrine in the world war era and during the cold war; and explains why counterinsurgency has become such a problem. The book concludes with the spread of peace in the developed world, challenged as it is by the rise of the authoritarian-capitalist great powers - China and Russia - and by the chilling prospect of unconventional terrorism. This last essay summarizes the author’s latest research and has not previously been published in article form. This collection will be of much interest to students of strategic studies, military history, and international relations.