WHAT we have said about the defensive battle throws a strong light upon the offensive also.
We there had in view that class of battle in which the defensive appears most decidedly pronounced, in order that we might convey a more vivid impression of its nature;—but only the fewer number are of that kind; most battles are demirencontres in which the defensive character disappears to a great extent. It is otherwise with the offensive battle: it preserves its character under all circumstances, and can keep up that character the more boldly, as the defender is out of his proper esse. For this reason, in the battle which is not purely defensive and in the real rencontres, there always remains also something of the difference of the character of the battle on the one side and on the other. The chief distinctive characteristic of the offensive battle is the manœuvre to turn or surround, therefore, the initiative as well.
A combat in lines, formed to envelope, has evidently in itself great advantages; it is, however, a subject of tactics. The attack must not give up these advantages because the defence has a means of counteracting them; for the attack itself cannot make use of that means, inasmuch as it is one that is too closely dependent upon other things connected with the defence. To be able in turn to operate with success against the flanks of an enemy, whose aim is to turn our line, it is necessary to have a well chosen and well prepared position. But what is much more important is, that all the advantages which the defensive possesses, cannot be made use of; most defences are poor makeshifts; the greater number of defenders find themselves in a very harassing and critical position, in which, expecting the worst, they meet the attack half way. The consequence of this is, that battles formed with enveloping lines, or even with an oblique front, which should properly result from an advantageous relation of the lines of communication, are commonly the result of a moral and physical preponderance (Marengo, Austerlitz, Jena). Besides, in the first battle fought, the base of the assailant, if not superior to that of the defender, is still mostly very wide in extent, on account of the proximity of the frontier; he can, therefore, afford to venture a little.—The flank-attack, that is, the battle with oblique front, is moreover generally more efficacious than the enveloping form. It is an erroneous idea that an enveloping strategic advance from the very commencement must be connected with it, as at Prague. (That strategic measure has seldom anything in common with it, and is very hazardous; of which we shall speak further in the attack of a theatre of war.)
As it is an object with the commander in the defensive battle to delay the decision as long as possible, and gain time, because a defensive battle undecided at sunset is commonly one gained: therefore the commander, in the offensive battle, requires to hasten the decision; but, on the other hand, there is a great risk in too much haste, because it leads to a waste of forces. One peculiarity in the offensive battle is the uncertainty, in most cases, as to the position of the enemy; it is a complete groping about amongst things that are unknown (Austerlitz, Wagram, Hohenlinden, Jena, Katzbach). The more this is the case, so much the more concentration of forces becomes paramount, and turning a flank to be preferred to surrounding. That the principal fruits of victory are first gathered in the pursuit, we have already learnt in the twelfth chapter of the 4th Book. According to the nature of the thing, the pursuit is more an integral part of the whole action in the offensive than in the defensive battle.