WE have now come to the exposition of the part Cavalry will play in the great battle of all Arms, which, says von Bernhardi, is always "pre-arranged." But it will occur to the reader at once that, so far as our inquiry about fire and the steel in combat is concerned, there can be nothing new to be said. There are firearms in all warfare, and the tactical principles they enforce will be approximately constant. Every great battle takes the form of a series of "attacks on localities," or "battles of encounter," however we interpret those phrases. If an enemy, to whatever Arm belonging, who takes up a "defensive attitude" can only be attacked by fire in a fight of the Independent Cavalry, he can only be attacked by fire in a pre-arranged battle; and if the led horses are a paralyzing encumbrance in the one case, they are equally so in the other. The great battle, it is true, presents a more positive and obvious example of the co-operation of the various Arms; but, as we have seen, the co-operation "of other arms" has been regarded by the author as a normal incident of the combats he has already described, and the "purely Cavalry fight" as an altogether exceptional incident. And since even the purest Cavalry carry the rifle, they can at any moment sully the purity of the said fight by resort to that sordid but formidable weapon. The author, as we might expect, only dimly appreciates the universality of his own principles--if the mutually destructive propositions which he alternately lays down can be properly termed principles. He constantly confuses tactics with combat. Different rules, of course, must always govern the action of mounted troops and horseless troops, because the one class is more mobile than the other; but it is impossible to lay down any lucid and intelligible principles for modern war until we realize the ubiquity and the supremacy of the missile weapon, rifle or gun.