Mann examines the history of war through the ages and across the globe-from ancient Rome to Ukraine, from imperial China to the Middle East, from Japan and Europe to Latin and North America. He explores the reasons groups go to war, the different forms of wars, how warfare has changed and how it has stayed the same, and the surprising ways in which seemingly powerful countries lose wars. In combining ideological, economic, political, and military analysis, Mann offers new insight into the many consequences of choosing war.