This book, originally published in 1980, is a study of the nature and purposes of peace-time military organization in Europe, and of the characteristics and outcome of the major wars fought during these years. It charts the rise of mass armies and the role of conscription as a socializing agent and a military instrument, as well as discussing the growing involvement of society in war both as agent and target of military activity, the mounting effort required of a society in order to ahcieve victory, culminating in the 'Total War' of 1939-45. Among other subjects explored are the development of war economies, the genesis and significance of war aims, the importance of social cohesion in modern war and the impact of technology.