WE have already explained what the defensive is generally, namely, nothing more than a stronger form of carrying on war (page 69), by means of which we endeavour to wrest a victory, in order, after having gained a superiority, to pass over to the offensive, that is to the positive object of war.
Even if the intention of a war is only the maintenance of the existing situation of things, the status quo, still a mere parrying of a blow is something quite contradictory to the conception of the term war, because the conduct of war is unquestionably no mere state of endurance. If the defender has obtained an important advantage, then the defensive form has done its part, and under the protection of this success he must give back the blow, otherwise he exposes himself to certain destruction; common sense points out that iron should be struck while it is hot, that we should use the advantage gained to guard against a second attack. How, when and where this reaction shall commence is subject certainly to a number of other conditions, which we can only explain hereafter. For the present we keep to this, that we must always consider this transition to an offensive return as a natural tendency of the defensive, therefore as an essential element of the same, and always conclude that there is something wrong in the management of a war when a victory gained through the defensive form is not turned to good account in any manner, but allowed to wither away.
A swift and vigorous assumption of the offensive—the flashing sword of vengeance—is the most brilliant point in the defensive; he who does not at once think of it at the right moment, or rather he who does not from the first include this transition in his idea of the defensive will never understand the superiority of the defensive as a form of war; he will be for ever thinking only of the means which will be consumed by the enemy and gained by ourselves through the offensive, which means however depend not on tying the knot, but on untying it. Further, it is a stupid confusion of ideas if, under the term offensive, we always understand sudden attack or surprise, and consequently under defensive imagine nothing but embarrassment and confusion.
It is true that a conqueror makes his determination to go to war sooner than the unconscious defender, and if he knows how to keep his measures properly secret, he may also perhaps take the defender unawares; but that is a thing quite foreign to war itself, for it should not be so. War actually takes place more for the defensive than for the conqueror, for invasion only calls forth resistance, and it is not until there is resistance that there is war. A conqueror is always a lover of peace (as Buonaparte always asserted of himself); he would like to make his entry into our state unopposed; in order to prevent this, we must choose war, and therefore also make preparations, that is in other words, it is just the weak, or that side which must defend itself, which should be always armed in order not to be taken by surprise; so it is willed by the art of war.
The appearance of one side sooner than the other in the theatre of war depends, besides, in most cases on things quite different from a view to offensive or defensive. But although a view to one or other of these forms is not the cause, it is often the result of this priority of appearance. Whoever is first ready will on that account go to work offensively, if the advantage of surprise is sufficiently great to make it expedient; and the party who is the last to be ready can only then in some measure compensate for the disadvantage which threatens him by the advantages of the defensive.
At the same time, it must be looked upon in general as an advantage for the offensive, that he can make that good use of being the first in the field which has been noticed in the third book; only this general advantage is not an absolute necessity in every case.
If, therefore, we imagine to ourselves a defensive, such as it should be, we must suppose it with every possible preparation of all means, with an army fit for, and inured to, war, with a general who does not wait for his adversary with anxiety from an embarrassing feeling of uncertainty, but from his own free choice, with cool presence of mind, with fortresses which do not dread a siege, and lastly, with a loyal people who fear the enemy as little as he fears them. With such attributes the defensive will act no such contemptible part in opposition to the offensive, and the latter will not appear such an easy and certain form of war, as it does in the gloomy imaginations of those who can only see in the offensive courage, strength of will, and energy; in the defensive, helplessness and apathy.