The possession of elevated ground may therefore become virtually command, and we can by no means deny that this idea represents a reality. But nevertheless the expressions “commanding ground,” “sheltering position,” “key of the country,” in so far as they are founded on the nature of heights and descents, are hollow shells without any sound kernel. These imposing elements of theory have been chiefly resorted to in order to give a flavour to the seeming commonplace of military combinations; they have become the darling themes of learned soldiers, the magical wands of adepts in strategy, and neither the emptiness of these fanciful conceits, nor the frequent contradictions which have been given to them by the results of experience have sufficed to convince authors, and those who read their books, that with such phraseology they are drawing water in the leaky vessel of the Danaides. The conditions have been mistaken for the thing itself, the instrument for the hand. The occupation of such and such a position or space of ground, has been looked upon as an exercise of power like a thrust or a cut, the ground or position itself as a substantive quantity; whereas the one is like the lifting of the arm, the other is nothing but the lifeless instrument, a mere property which can only realise itself upon an object, a mere sign of plus or minus which wants the figures or quantities. This cut and thrust, this object, this quantity, is _a victorious battle;_ it alone really counts; with it only can we reckon; and we must always have it in view, as well in giving a critical judgment in literature as in real action in the field. Consequently, if nothing but the number and value of victorious combats decides in war, it is plain that the comparative value of the opposing armies and ability of their respective leaders again rank as the first points for consideration, and that the part which the influence of ground plays can only be one of an inferior grade. BOOK VI DEFENCE CHAPTER I. Offence and Defence 1.—Conception of Defence.