Between the moment of the first assembling of military forces, and that of the solution arrived at maturity when strategy has brought the army to the decisive point, and each particular part has had its position and rôle pointed out by tactics, there is in most cases a long interval; it is the same between one decisive catastrophe and another. Formerly these intervals in a certain measure did not belong to war at all. Take for example the manner in which Luxemburg encamped and marched. We single out this general because he is celebrated for his camps and marches, and therefore may be considered a representative general of his period, and from the _Histoire de la Flandre militaire_, we know more about him than about other generals of the time. The camp was regularly pitched with its rear close to a river, or morass, or a deep valley, which in the present day would be considered madness. The direction in which the enemy lay had so little to do with determining the front of the army, that cases are very common in which the rear was towards the enemy and the front towards their own country. This now unheard of mode of proceeding is perfectly unintelligible, unless we suppose that in the choice of camps the convenience of the troops was the chief, indeed almost the only consideration, and therefore look upon the state of being in camp as a state outside of the action of war, a kind of withdrawal behind the scenes, where one is quite at ease. The practice of always resting the rear upon some obstacle may be reckoned the only measure of security which was then taken, of course, in the sense of the mode of conducting war in that day, for such a measure was quite inconsistent with the possibility of being compelled to fight in that position. But there was little reason for apprehension on that score, because the battles generally depended on a kind of mutual understanding, like a duel, in which the parties repair to a convenient rendezvous. As armies, partly on account of their numerous cavalry, which in the decline of its splendour was still regarded, particularly by the French, as the principal arm, partly on account of the unwieldy organisation of their order of battle, could not fight in every description of country, an army in a close broken country was as it were under the protection of a neutral territory, and as it could itself make but little use of broken ground, therefore, it was deemed preferable to go to meet an enemy seeking battle. We know, indeed, that Luxemburg’s battles at Fleurus, Stienkirk, and Neerwinden, were conceived in a different spirit; but this spirit had only just then under this great general freed itself from the old method, and it had not yet reacted on the method of encampment. Alterations in the art of war originate always in matters of a decisive nature, and then lead by degrees to modifications in other things. The expression _il va à la guerre_, used in reference to a partizan setting out to watch the