It often happens that those who discuss war, taking the weapon for the starting point, assume unhesitatingly that the man called to serve it will always use it as contemplated and ordered by the regulations. But such a being, throwing off his variable nature to become an impassive pawn, an abstract unit in the combinations of battle, is a creature born of the musings of the library, and not a real man. Man is flesh and blood; he is body and soul. And, strong as the soul often is, it can not dominate the body to the point where there will not be a revolt of the flesh and mental perturbation in the face of destruction. The human heart, to quote Marshal de Saxe, is then the starting point in all matters pertaining to war. Let us study the heart, not in modern battle, complicated and not readily grasped, but in ancient battle. For, although nowhere explained in detail, ancient battle was simple and clear. Centuries have not changed human nature. Passions, instincts, among them the most powerful one of self-preservation, may be manifested in various ways according to the time, the place, the character and temperament of the race. Thus in our times we can admire, under the same conditions of danger, emotion and anguish, the calmness of the English, the dash of the French, and that inertia of the Russians which is called tenacity. But at bottom there is always found the same man. It is this man that we see disposed of by the experts, by the masters, when they organize and discipline, when they order detailed combat methods and take general dispositions for action. The best masters are those who know man best, the man of today and the man of history. This knowledge naturally comes from a study of formations and achievements in ancient war. The development of this work leads us to make such an analysis, and from a study of combat we may learn to know man. Let us go even back of ancient battle, to primeval struggle. In progressing from the savage to our times we shall get a better grasp of life. And shall we then know as much as the masters? No more than one is a painter by having seen the methods of painting. But we shall better understand these able men and the great examples they have left behind them. We shall learn from them to distrust mathematics and material dynamics as applied to battle principles. We shall learn to beware of the illusions drawn from the range and the maneuver field. There, experience is with the calm, settled, unfatigued, attentive, obedient soldier, with an intelligent and tractable man-instrument in short, and not with the nervous, easily swayed, moved, troubled, distrait, excited, restless being, not even under self-control, who is the fighting man from general to private. There are strong men, exceptions, but they are rare.