9, 10.] To trace the campaigns of great soldiers under the guidance of such a critic as Jomini is full of interest to any intelligent person, and there is nothing in the subject of the slightest difficulty of comprehension if full and authentic topographical maps are before the reader.

To make much instructive use of military history in this way demands a good deal of voluminous reading and the command of charts and maps extensive enough to allow the presentation of the face of a country on a large scale.

With these advantages all wars, both ancient and modern, are full of instructive examples of the application of the simple principles of strategy under innumerable varying circumstances and situations; and this union of simple theory in ever-changing practical application is what constitutes the theoretic knowledge of the general as distinguished from the tactical and administrative duties of the subordinate.

[Footnote: Jomini expresses it thus: "J'en couclus que l'histoire militaire raisonnee de plusieurs campagnes, seront la meilleure Ecole pour apprendre et par consequent pour enseigner la grande guerre: _la science des generaux._" Grandes Operations Militaires, vol.i.p.

7.] It was the very simplicity of the principles that made many successful generals question whether there was any art in the matter, except to use courage and natural sagacity in the actual situation in which the commander found himself and the enemy.