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 (Jomini: "l'art de diriger les armées sur les théatres d'opérations") , tactics the science of the use of military forces in battle (Jomini: "l'art de diriger les troupes sur les champs de bataille"). General von Horsetzki (1892) defines strategy as the study of the conditions necessary for success in war. Archduke Charles calls strategy the "science of war" and tactics the "art of war". Frederick the Great and Napoleon always employed the term "l'art de guerre" instead of the term "strategy". None of these definitions are comprehensive enough, because they do not cover marches, outposts, the supply service, and enterprises in minor tactics. Professor Delbrück's definition is much more appropriate: "Strategy is the science of utilizing military resources for the attainment of the object of the war, tactics the art of leading troops into and in battle." Thiers, the French historian, instead of seeking to define strategy and tactics, contents himself with explaining the problems of each: "Le stratège doit concevoir le plan de campagne, embrasser d'un seul coup d'oeilil] tout le théatre présumé de la guerre, tracer lignes d'opérations et diriger les masses sur les points décisifs. Le tacticien a pour mission de régler l'ordre de leurs marches, de les disposer en bataille aux différents points, indiqués par le stratège, d'engager l'action, de la soutenir et de manoeuvreruvrer] pour atteindre le but proposé." Fieldmarshal Moltke calls strategy "the