IRRESPECTIVE quite of their influence as regards the means of subsistence of an army, country and ground, bear another most intimate and never-failing relation to the business of war, which is their decisive influence on the battle, both upon what concerns its course, as well as upon the preparation for it, and the use to be made of it. We now proceed to consider country and ground in this phase, that is, in the full meaning of the French expression "Terrain."
The way to make use of them is a subject which lies mostly within the province of tactics, but the effects resulting from them appear in strategy; a battle in the mountains is, in its consequences as well as in itself, quite a different thing from a battle on a level plain.
But until we have studied the distinction between offensive and defensive, and examined the nature of each separately and fully, we cannot enter upon the consideration of the principal features of the ground in their effects; we must therefore for the present confine ourselves to an investigation of its general properties. There are three properties through which the ground has an influence on action in war; that is, as presenting an obstacle to approach, as an obstacle to an extensive view, and as protection against the effect of fire-arms; all other effects may be traced back to these three.
Unquestionably this threefold influence of ground has a tendency to make warfare more diversified, more complicated, and more scientific, for they are plainly three more quantities which enter into military combinations.
A completely level plain, quite open at the same time, that is, a tract of country which cannot influence war at all, has no existence except in relation to small bodies of troops, and with respect to them only for the duration of some given moment of time. When larger bodies are concerned, and a longer duration of time, accidents of ground mix themselves up with the action of such bodies, and it is hardly possible in the case of a whole army to imagine any particular moment, such as a battle, when the ground would not make its influence felt.
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.
Now the more these qualifications and influences are wanting in an army, the greater they are on the side of its opponent, so much the more will it dread being split into fractions, the more it will avoid a broken country; but to avoid fighting in such a description of country is seldom a matter of choice; we cannot choose a theatre of war like a piece of merchandise from amongst several patterns, and thus we find generally that armies which from their nature fight with advantage in concentrated masses, exhaust all their ingenuity in trying to carry out their system as far as possible in direct opposition to the nature of the country. They must in consequence submit to other disadvantages, such as scanty and difficult subsistence for the troops, bad quarters, and in the combat numerous attacks from all sides; but the disadvantage of giving up their own special advantage would be greater.
These two tendencies in opposite directions, the one to concentration the other to dispersion of forces, prevail more or less according as the nature of the troops engaged incline them more to one side or the other, but however decided the tendency, the one side cannot always remain with his forces concentrated, neither can the other expect success by following his system of warfare in scattered bodies on all occasions. The French were obliged to resort to partitioning their forces in Spain, and the Spaniards, whilst defending their country by means of an insurgent population, were obliged to try the fate of great battles in the open field with part of their forces.
Next to the connection which country and ground have with the general, and especially with the political, composition of the forces engaged, the most important point is the relative proportion of the three arms.
In all countries which are difficult to traverse, whether the obstacles are mountains, forests, or a peculiar cultivation, a numerous cavalry is useless: that is plain in itself; it is just the same with artillery in wooded countries; there will probably be a want of room to use it with effect, of roads to transport it, and of forage for the horses. For this arm highly cultivated countries are less disadvantageous, and least of all a mountainous country. Both, no doubt, afford cover against its fire, and in that respect they are unfavourable to an arm which depends entirely on its fire: both also often furnish means for the enemy's infantry to place the heavy artillery in jeopardy, as infantry can pass anywhere; but still in neither is there in general any want of space for the use of a numerous artillery, and in mountainous countries it has this great advantage, that its effects are prolonged and increased in consequence of the movements of the enemy being slower.
But it is undeniable that infantry has a decided advantage over every other arm in difficult country, and that, therefore, in such a country its number may considerably exceed the usual proportion.