On War

by Carl von Clausewitz

In the Seven Years’ War, at least in the last three years of it, Frederick the Great did not think of an offensive; indeed we believe further, that generally speaking, he only acted on the offensive at any time in this war as the best means of defending himself; his whole situation compelled him to this course, and it is natural that a general should aim more immediately at that which is most in accordance with the situation in which he is placed for the time being. Nevertheless, we cannot look at this example of a defence upon a great scale without supposing that the idea of a possible counterstroke against Austria lay at the bottom of the whole of it, and saying to ourselves, the moment for that counterstroke had not arrived before the war came to a close. The conclusion of peace shows that this idea is not without foundation even in this instance; for what could have actuated the Austrians to make peace except the thought that they were not in a condition with their own forces alone to make head against the talent of the king; that to maintain an equilibrium their exertions must be greater than heretofore, and that the slightest relaxation of their efforts would probably lead to fresh losses of territory. And, in fact, who can doubt that if Russia, Sweden, and the army of the German Empire had ceased to act together against Frederick the Great he would have tried to conquer the Austrians again in Bohemia and Moravia?

Having thus defined the true meaning of the defensive, having defined its boundaries, we return again to the assertion that the defensive is the stronger form of making war.

Upon a closer examination, and comparison of the offensive and defensive, this will appear perfectly plain; but for the present we shall confine ourselves to noticing the contradiction in which we should be involved with ourselves, and with the results of experience by maintaining the contrary to be the fact. If the offensive form was the stronger there would be no further occasion ever to use the defensive, as it has merely a negative object, every one would be for attacking, and the defensive would be an absurdity. On the other hand, it is very natural that the higher object should be purchased by greater sacrifices. Whoever feels himself strong enough to make use of the weaker form has it in his power to aim at the greater object; whoever sets before himself the smaller object can only do so in order to have the benefit of the stronger form—If we look to experience, such a thing is unheard of as any one carrying on a war upon two different theatres—offensively on one with the weaker army, and defensively on the other with his strongest force But if the reverse of this has everywhere and at all times taken place that shows plainly that generals although their own inclination prompts them to the offensive, still hold the defensive to be the stronger form. We have still in the next chapters to explain some preliminary points.

CHAPTER II.
The Relations of the Offensive and Defensive to Each Other in Tactics

First of all we must inquire into the circumstances which give the victory in a battle.

Of superiority of numbers, and bravery, discipline, or other qualities of an army, we say nothing here, because, as a rule, they depend on things which lie out of the province of the art of war in the sense in which we are now considering it; besides which they exercise the same effect in the offensive as the defensive; and, moreover also, the superiority in numbers in general cannot come under consideration here, as the number of troops is likewise a given quantity or condition, and does not depend on the will or pleasure of the general. Further, these things have no particular connection with attack and defence. But, irrespective of these things, there are other three which appear to us of decisive importance, these are: surprise, advantage of ground, and the attack from several quarters. The surprise produces an effect by opposing to the enemy a great many more troops than he expected at some particular point. The superiority in numbers in this case is very different to a general superiority of numbers; it is the most powerful agent in the art of war.—The way in which the advantage of ground contributes to the victory is intelligible enough of itself, and we have only one observation to make which is, that we do not confine our remarks to obstacles which obstruct the advance of an enemy, such as scarped grounds, high hills, marshy streams, hedges, inclosures, etc.; we also allude to the advantage which ground affords as cover, under which troops are concealed from view. Indeed we may say that even from ground which is quite unimportant a person acquainted with the locality may derive assistance. The attack from several quarters includes in itself all tactical turning movements great and small, and its effects are derived partly from the double execution obtained in this way from fire-arms, and partly from the enemy’s dread of his retreat being cut off.

Now how do the offensive and defensive stand respectively in relation to these things?

Having in view the three principles of victory just described, the answer to this question is, that only a small portion of the first and last of these principles is in favour of the offensive, whilst the greater part of them, and the whole of the second principle, are at the command of the party acting defensively.

The offensive side can only have the advantage of one complete surprise of the whole mass with the whole, whilst the defensive is in a condition to surprise incessantly, throughout the whole course of the combat, by the force and form which he gives to his partial attacks.

The offensive has greater facilities than the defensive for surrounding and cutting off the whole, as the latter is in a manner in a fixed position while the former is in a state of movement having reference to that position. But the superior advantage for an enveloping movement, which the offensive possesses, as now stated, is again limited to a movement against the whole mass; for during the course of the combat, and with separate divisions of the force, it is easier for the defensive than for the offensive to make attacks from several quarters, because, as we have already said, the former is in a better situation to surprise by the force and form of his attacks.