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CHAPTER I: INTRODUCTION - Carl von Clausewitz, On War, vol. 3 
On War, trans. Col. J.J. Graham. New and Revised edition with Introduction and Notes by Col. F.N. Maude, in Three Volumes (London: Kegan Paul, Trench, Trubner & C., 1918). Vol. 3.
Part of: On War
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In the chapter on the essence and object of War, we sketched, in a certain measure, its general conception, and pointed out its relations to surrounding circumstances, in order to commence with a sound fundamental idea. We there cast a glance at the manifold difficulties which the mind encounters in the consideration of this subject, whilst we postponed the closer examination of them, and stopped at the conclusion, that the overthrow of the enemy, consequently the destruction of his combatant force, is the chief object of the whole of the action of War. This put us in a position to show in the following chapter, that the means which the act of War employs is the combat alone. In this manner we think we have obtained at the outset a correct point of view.
Having now gone through singly all the principal relations and forms which appear in military action, but are extraneous to, or outside of, the combat, in order that we might fix more distinctly their value, partly through the nature of the thing, partly from the lessons of experience which military history affords, purify them from, and root out, those vague ambiguous ideas which are generally mixed up with them, and also to put prominently forward the real object of the act of War, the destruction of the enemy’s combatant force as the primary object universally belonging to it; we now return to War as a whole, as we propose to speak of the Plan of War, and of campaigns; and that obliges us to revert to the ideas in our first book.
In these chapters, which are to deal with the whole question, is contained Strategy, properly speaking, in its most comprehensive and important features. We enter this innermost part of its domain, where all other threads meet, not without a degree of diffidence, which, indeed, is amply justified.
If, on the one hand, we see how extremely simple the operations of War appear; if we hear and read how the greatest Generals speak of it, just in the plainest and briefest manner, how the government and management of this ponderous machine, with its hundred thousand limbs, is made no more of in their lips than if they were only speaking of their own persons, so that the whole tremendous act of War is individualised into a kind of duel; if we find the motives also of their action brought into connection sometimes with a few simple ideas, sometimes with some excitement of feeling; if we see the easy, sure, we might almost say light manner, in which they treat the subject—and now see, on the other hand, the immense number of circumstances which present themselves for the consideration of the mind; the long, often indefinite distances to which the threads of the subject run out and the number of combinations which lie before us; if we reflect that it is the duty of theory to embrace all this systematically, that is with clearness and fulness, and always to refer the action to the necessity of a sufficient cause, then comes upon us an overpowering dread of being dragged down to a pedantic dogmatism, to crawl about in the lower regions of heavy abstruse conceptions, where we shall never meet any great captain, with his natural coup d’œil. If the result of an attempt at theory is to be of this kind, it would have been as well, or rather, it would have been better, not to have made the attempt; it could only bring down on theory the comtempt of genius, and the attempt itself would soon be forgetten. And on the other hand, this facile coup d’œil of the General, this simple art of forming notions, this personification of the whole action of War, is so entirely and completely the soul of the right method of conducting War, that in no other but this broad way is it possible to conceive that freedom of the mind which is indispensable if it is to dominate events, not to be overpowered by them.
With some fear we proceed again; we can only do so by pursuing the way which we have prescribed for ourselves from the first. Theory ought to throw a clear light on the mass of objects, that the mind may the easier find its bearings; theory ought to pull up the weeds which error has sown broadcast; it should show the relations of things to each other, separate the important from the trifling. Where ideas resolve themselves spontaneously into such a core of Truth as is called Principle, when they of themselves keep such a line as forms a rule, Theory should indicate the same.
Whatever the mind seizes, the rays of light which are awakened in it by this exploration amongst the fundamental notions of things, that is the assistance which Theory affords the mind. Theory can give no formulas with which to solve problems; it cannot confine the mind’s course to the narrow line of necessity by Principle set up on both sides. It lets the mind take a look at the mass of objects and their relations, and then allows it to go free to the higher regions of action, there to act according to the measure of its natural forces, with the energy of the whole of those forces combined, and to grasp the True and the Right, as one single clear idea, which, shooting forth from under the united pressure of all these forces, would seem to be rather a product of feeling than of reflection.