The Leader must always keep before his eyes the demands which either pursuit or retreat may make on his horses. One should never sacrifice, to secure results of secondary consideration, means that can be used to better purposes at other times and other places, for the calls which may be made upon Cavalry after the battle are quite exceptional in their nature. When, after long marches, hours of fighting, and heavy losses, the exhausted victor bivouacs on the hard-won field, when the day is drawing to its close and the shadows are spreading far across the pastures, then the real work of the Cavalry begins; then, without drawing rein, the horsemen must press forward to intercept the enemy's retreat, attack him anywhere where he least expects it, and harry him to utter exhaustion and dispersal (see Book I., Chap. IV., 1.4); or it must, under the difficult conditions of a retreat at night, sacrifice itself in charges or in protracted fire action in every direction in which the pursuing Army can threaten danger to the retreating columns. In such situations they must be prepared to hold suitable positions by the hour, without thought for their own retreat, without any knowledge of the general situation, and without any connection with the remainder of their forces. Threatened in flank and rear, and yet unshaken by the general collapse, by the flight and panic of their comrades, they must hold their own, relying on their own strength and self-reliance. These are the conditions which make the highest demands both on the material and moral excellence of the men, as well as on the indomitable energy and skill of the Cavalry Leader, and to few mortals is it given to prove equal to such contingencies; hence one must prepare one's self beforehand for such situations. Primarily one must remember to give opportunities to both men and horses to feed, water, and rest even during the progress of the battle. One must endeavour, even while the fight is still raging, to become perfectly clear in one's own mind as to the possible lines of retreat, and the probable ulterior operations. One must try to impress upon one's memory the lie of the roads according to the map, and the important defiles and positions which might be favourable either to pursuit or retreat, in order to be able to act at the right moment, without loss of time or hesitation, in full cognizance of the circumstances of the case. _Nothing helps a decision more than a complete intellectual command of the situation._