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 be encountered in war (maneuvers). The means available in tactical instruction in time of peace, for the development of strength of character, are, however, very limited when compared with the great demands made by the abnormal conditions of war, so out of all proportion to those of peace. This should be thoroughly understood, lest we overestimate the value of these means as well as the results to be obtained from them in times of peace.

After theory has fulfilled its mission of clearly indicating the purpose and object of an operation, as well as the means by which it may be attained, and applicatory practice has performed its office of developing initiative and professional skill, a third factor is still necessary—the study of military history. From this fountain of knowledge both "theory" and "applicatory method" must draw their material; to this source they must again and again refer in order to guard against erroneous ideas of their own creation, which are often as different from reality as day is from night."

Viewed as the science of the leading and employment of troops, tactics may be divided into two parts:

1. Formal tactics, or that contained in drill regulations. This portion of tactics furnishes the formations used by troops when assembled, on the march, and in action, and contains the regulations governing the conduct in battle of troops acting alone without regard to the coöperation of the other arms, and without reference to the terrain.

2. Applied tactics deals with the combined action of the several arms on the march, in camp, and in action, taking into account influences of the terrain, seasons, and the time of day in field warfare. Fortress warfare should, strictly