Carl von Clausewitz's major theoretical work, On War, has retained its freshness and relevance since it first appeared 160 years ago. Clausewitz was also a wide-ranging, innovative historian--his acerbic history of Prussia before 1806 became an underground classic long before it could be published--and a combative political essayist, whose observations on the affairs of Germany and Europe combine social egalitarianism with a nearly Bismarckian...