Front Page Titles (by Subject) CHAPTER XII: MARCHES ( Continued ) - On War, vol. 2
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CHAPTER XII: MARCHES ( Continued ) - Carl von Clausewitz, On War, vol. 2 
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. 2.
Part of: On War
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We have now to consider the destructive influence which marches exercise upon an Army. It is so great that it may be regarded as an active principle of destruction, just as much as the combat.
One single moderate march does not wear down the instrument, but a succession of even moderate marches is certain to tell upon it, and a succession of severe ones will, of course, do so much sooner.
At the actual scene of War, want of food and shelter, bad, broken-up, roads, and the necessity of being in a perpetual state of readiness for battle, are causes of an excessive strain upon our means, by which men, cattle, carriages of every description as well as clothing are ruined.
It is commonly said that a long rest does not suit the physical health of an Army; that at such a time there is more sickness than during moderate activity. No doubt sickness will and does occur if soldiers are packed too close in confined quarters; but the same thing would occur in quarters taken up on the march, and the want of air and exercise can never be the cause of such sicknesses, as it is so easy to give the soldier both by means of his exercises.
Only think for a moment, when the organism of a human being is in a disordered and fainting state, what a difference it must make to him whether he falls sick in a house or is seized in the middle of a high road, up to his knees in mud, under torrents of rain, and loaded with a knapsack on his back; even if he is in a camp he can soon be sent to the next village, and will not be entirely without medical assistance, whilst on a march he must be for hours without any assistance, and then be made to drag himself along for miles as a straggler. How many trifling illnesses by that means become serious, how many serious ones become mortal. Let us consider how an ordinary march in the dust, and under the burning rays of a summer sun may produce the most excessive heat, in which state, suffering from intolerable thirst, the soldier then rushes to the first puddle of water, to bring back for himself sickness and death.
It is not our object by these reflections to recommend less activity in War; the instrument is there for use, and if the use wears away the instrument that is only in the natural order of things; we only wish to see everything put in its right place, and to oppose that theoretical bombast according to which the most astonishing surprises the most rapid movements, the most incessant activity cost nothing, and are painted as rich mines which the indolence of the General leaves unworked. It is very much the same with these mines as with those from which gold and silver are obtained; nothing is seen but the produce, and no one asks about the value of the work which has brought this produce to light.
On long marches outside a theatre of War, the conditions under which the march is made are no doubt usually easier, and the daily losses smaller, but on that account men with the slightest sickness are generally lost to the army for some time, as it is difficult for convalescents to overtake an Army constantly advancing.
Amongst the cavalry the number of lame horses and horses with sore backs rises in an increasing ratio, and amongst the carriages many break down or require repair. It never fails, therefore, that at the end of a march of 500 miles or more, an Army arrives much weakened, particularly as regards its cavalry and train.
If such marches are necessary on the theatre of War, that is under the eyes of the enemy, then that disadvantage is added to the other, and from the two combined the losses with large masses of troops, and under conditions otherwise unfavourable may amount to something incredible.
Only a couple of examples in order to illustrate our ideas.
When Buonaparte crossed the Niemen on 24th June 1812, the enormous centre of his Army with which he subsequently marched against Moscow numbered 301,000 men. At Smolensk, on the 15th August, he detached 13,500, leaving, it is to be supposed, 287,500. The actual state of his army however at that date was only 182,000; he had therefore lost 105,000.* Bearing in mind that up to that time only two engagements to speak of had taken place, one between Davoust and Bagration, the other between Murat and Tolstoy-Osterman, we may put down the losses of the French Army in action at 10,000 men at most, and therefore the losses in sick and stragglers within fifty-two days on a march of about 350 miles direct to his front, amounted to 95,000, that is a third part of the whole force.
Three weeks later, at the time of the battle of Borodino, the loss amounted to 144,000 (including the casualties in the battle), and eight days after that again, at Moscow, the number was 198,000. The losses of this Army in general were at the commencement of the campaign at the rate of daily, subsequently they rose to , and in the last period they increased to of the original strength.
The movement of Napoleon from the passage of the Niemen up to Moscow certainly may be called a persistent one; still, we must not forget that it lasted eighty-two days, in which time he only accomplished 600 miles, and that the French Army upon two occasions made regular halts, once at Wilna for about fourteen days, and the other time at Witebsk for about eleven days, during which periods many stragglers had time to rejoin. This fourteen weeks’ advance was not made at the worst season of the year, nor over the worst of roads, for it was summer, and the roads along which they marched were mostly sand. It was the immense mass of troops collected on one road, the want of sufficient subsistence, and an enemy who was on the retreat, but by no means in flight, which were the adverse conditions.
Of the retreat of the French from Moscow to the Niemen, we shall say nothing, but this we may mention, that the Russian Army following them left Kaluga 120,000 strong, and reached Wilna with 30,000. Every one knows how few men were lost in actual combats during that period.
One more example from Blücher’s campaign of 1813 in Silesia and Saxony, a campaign very remarkable not for any long march but for the amount of marching to and fro. York’s corps of Blücher’s army began this campaign 16th August about 40,000 strong, and was reduced to 12,000 at the battle of Leipsic, 19th October. The principal combats which this corps fought at Goldberg, Lowenberg, on the Katzbach, at Wartenburg, and Mockern (Leipsic) cost it on the authority of the best writers, 12,000 men. According to that their losses from other causes in eight weeks amounted to 16,000, or two-fifths of the whole.
We must, therefore, make up our minds to great wear and tear of our own forces, if we are to carry on a War rich in movements, we must arrange the rest of our plan accordingly, and above all things the reinforcements which are to follow.
[* ]All these figures are taken from Chambray. Compare vol. vii., 2nd edition, § 80, ff.