To this must be added the fact that, in view of the many strategical necessities of a great Army, the Headquarters cannot always be in a position to allot to the Cavalry a clearly-defined task either of reconnaissance or security, attack or defence; thus higher considerations may prevent the massing of the Cavalry on a single road or any other similar simple distribution. More often than not one will have to suggest the simultaneous attainment of the most varied objectives, and the Cavalry Leader will be lucky if he is not called upon to solve problems of the most heterogeneous nature, things which in their execution mutually exclude one another. Hence one can only lay down the most general principles to govern the strategical employment of the Arm, and to meet this difficulty it becomes all the more important to develop the capacity for endurance of the troops to the utmost, so that they can successfully deal with these many variable demands. As to how far the independent Cavalry should be thrust out in front of the following columns of the Army, all that can be laid down is, that the wider the fronts and the deeper the Army--hence the longer time the Army will take to deploy, concentrate, change its position, or execute any similar operation depending on the reports of the Cavalry--the further that Cavalry must gain ground to the front. As to the principles governing the formal arrangement of the troops in contradiction to all attempts to lay down stereotyped formations, all that can be said is that every strategical operation, if for no other reason than to allow of reconnaissance and secure safety, requires a certain extension in breadth; but the combat itself demands concentration. It follows from the above that the Cavalry Commander must in every initial case weigh in his own mind how much the existing circumstances may allow him to extend, and, on the other hand, how closely they compel him to keep concentrated, and he will only be able to reconcile the dilemma when he is actually clear in his own mind as to the tactical and strategical results his conduct in either case will involve.