In short, he must exercise such prevision that he can never be overtaken by circumstances; and in every case in which action is called for in a new, and, perhaps, unexpected direction, he should be prepared to meet the emergency. In this way he will save himself much time and energy, but it will facilitate his very difficult task essentially if he is always kept informed in sufficient time of the views and possible intention of the Chief Command; for unless this condition is complied with, it will be impossible to insure that the whole energy of the Arm will be directed to the carrying out of its reconnoitring functions in conformity with the views entertained at Headquarters. It must be characterized as one of the most suicidal errors when the superior Command conceals its purposes from its executive organs. Diffused activity, waste of energy, misunderstandings, and confusion would be the inevitable consequences, and military history--not the least that of 1870-1871--gives a long role of illustrative examples. As regards all those operations which depend on surprise, the circumspection of the Leader becomes the decisive factor. Everything must be thought out beforehand, and carefully considered. The very soul and being of the Leader must be grasped by the men under his Command, and the utmost energy in the execution of his design be demanded from every individual. As a general rule, smaller bodies, which can conceal themselves behind features of the ground, and hardly require a service of security, can act quite differently to larger ones, which cannot conceal their presence and always require a certain degree of precaution for reconnaissance and security. Above all, mobility is the essence of the whole situation, and darkness will serve as a most important contributor to success. On main roads, where it is impossible to lose one's way, darkness can be used for forced marches to advantage if beforehand we are clear about the conditions on the side of the enemy, and hence can act with a certain degree of confidence. One factor must never be left out of consideration--viz., that under modern conditions the difficulties of action by surprise have been enormously increased, and the enemy is under certain circumstances enabled to paralyze the tactical results of surprise. This factor arises from the existence of railways and telegraphs, and it will act most detrimentally against us when moving in the enemy's country, where both arrangements favour our opponents. Telegraphs carry the news of the appearance of Cavalry far and wide beyond the points where they have been seen by the enemy's troops, and the railways forward supports to the threatened districts.