On War

by Carl von Clausewitz

This influence is therefore never in abeyance, but it is certainly stronger or weaker according to the nature of the country.

If we keep in view the great mass of topographical phenomena we find that countries deviate from the idea of perfectly open level plains principally in three ways: first by the form of the ground, that is, hills and valleys; then by woods, marshes, and lakes as natural features; and lastly, by such changes as have been introduced by the hand of man. Through each of these three circumstances there is an increase in the influence of ground on the operations of war. If we trace them up to a certain distance we have mountainous country, a country little cultivated and covered with woods and marshes, and the well cultivated. The tendency in each case is to render war more complicated and connected with art.

The degree of influence which cultivation exercises is greater or less according to the nature of the cultivation; the system pursued in Flanders, Holstein, and some other countries, where the land is intersected in every direction with ditches, dykes, hedges, and walls, interspersed with many single dwellings and small woods has the greatest effect on war.

The conduct of war is therefore of the easiest kind in a level moderately-cultivated country. This however only holds good in quite a general sense, leaving entirely out of consideration the use which the defensive can make of obstacles of ground.

Each of these three kinds of ground has an effect in its own way on movement, on the range of sight, and in the cover it affords.

In a thickly-wooded country the obstacle to sight preponderates; in a mountainous country, the difficulty of movement presents the greatest obstacle to an enemy; in countries very much cultivated both these obstacles exist in a medium degree.

As thick woods render great portions of ground in a certain manner impracticable for military movements, and as, besides the difficulty which they oppose to movement they also obstruct the view, thereby preventing the use of means to clear a passage, the result is that they simplify the measures to be adopted on one side in proportion as they increase the difficulties with which the other side has to contend. Although it is difficult practically to concentrate forces for action in a wooded country, still a partition of forces does not take place to the same extent as it usually does in a mountainous country, or in a country very much intersected with canals, rivers, &c.: in other words, the partition of forces in such a country is more unavoidable but not so great.

In mountains, the obstacles to movement preponderate and take effect in two ways, because in some parts the country is quite impassable, and where it is practicable we must move slower and with greater difficulty. On this account the rapidity of all movements is much diminished in mountains, and all operations are mixed up with a larger quantity of the element of time. But the ground in mountains has also the special property peculiar to itself, that one point commands another. We shall devote the following chapter to the discussion of the subject of commanding heights generally, and shall only here remark that it is this peculiarity which causes the great partition of forces in operations carried on amongst mountains, for particular points thus acquire importance from the influence they have upon other points in addition to any intrinsic value which they have in themselves.

As we have elsewhere observed, each of these three kinds of ground in proportion as its own special peculiarity has a tendency to an extreme, has in the same degree a tendency to lower the influence of the supreme command, increasing in like manner the independent action of subordinates down to the private soldier. The greater the partition of any force, the less an undivided control is possible, so much the more are subordinates left to themselves; that is self-evident. Certainly when the partition of a force is greater, then through the diversity of action and greater scope in the use of means the influence of intelligence must increase, and even the commander-in-chief may show his talents to advantage under such circumstances; but we must here repeat what has been said before, that in war the sum total of single results decides more than the form or method in which they are connected, and therefore, if we push our present considerations to an extreme case, and suppose a whole army extended in a line of skirmishers so that each private soldier fights his own little battle, more will depend on the sum of single victories gained than on the form in which they are connected; for the benefit of good combinations can only follow from positive results, not from negative. Therefore in such a case the courage, the dexterity, and the spirit of individuals will prove decisive. It is only when two opposing armies are on a par as regards military qualities, or that their peculiar properties hold the balance even, that the talent and judgment of the commander become again decisive. The consequence is that national armies and insurgent levies, etc., etc., in which, at least in the individual, the warlike spirit is highly excited, although they are not superior in skill and bravery, are still able to maintain a superiority by a great dispersion of their forces favoured by a difficult country, and that they can only maintain themselves for a continuance upon that kind of system, because troops of this description are generally destitute of all the qualities and virtues which are indispensable when tolerably large numbers are required to act as a united body.

Also in the nature of forces there are many gradations between one of these extremes and the other, for the very circumstance of being engaged in the defence of its own country gives to even a regular standing army something of the character of a national army, and makes it more suited for a war waged by an army broken up into detachments.