Читать книгу The Art of War in 19th Century - Carl von Clausewitz - Страница 46

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There are only two ways of insuring the success of a siege. The first, to begin by beating the enemy’s army employed to cover the place, forcing it out of the field, and throwing its remains beyond some great natural obstacle, such as a chain of mountains, or large river. Having accomplished this object, an army of observation should be placed behind the natural obstacle, until the trenches are finished and the place taken.

But if it be desired to take the place in presence of a relieving army, without risking a battle, then the whole materiel and equipment for a siege are necessary to begin with, together with ammunition and provisions for the presumed period of its duration, and also lines of contravallation and circumvallation, aided by all the localities of heights, woods, marshes and inundations.

Having no longer occasion to keep up communications with your depôts, it is now only requisite to hold in check the relieving army. For this purpose, an army of observation should be formed, whose business it is never to lose sight of that of the enemy, and which, while it effectually bars all access to the place, has always time enough to arrive upon his flanks or rear in case he should attempt to steal a march.

It is to be remembered, too, that by profiting judiciously by the lines of contravallation, a portion of the besieging army will always be available in giving battle to the approaching enemy.

Upon the same general principle, when a place is to be besieged in presence of an enemy’s army, it is necessary to cover the siege by lines of circumvallation.

If the besieging force is of numerical strength enough (after leaving a corps before the place four times the amount of the garrison) to cope with the relieving army, it may remove more than one day’s march from the place; but if it be inferior in numbers after providing for the siege, as above stated, it should remain only a short day’s march from the spot, in order to fall back upon its lines, if necessary, or receive succor in case of attack.

If the investing corps and army of observation are only equal when united to the relieving force, the besieging army should remain entire within, or near its lines, and push the works and the siege with the greatest activity.

NOTE.

“When we undertake a siege,” says Montécuculli, “we should not seek to place ourselves opposite the weakest part of the fortress, but at the point most favorable for establishing a camp and executing the designs we have in view.”

This maxim was well understood by the Duke of Berwick. Sent to form the siege of Nice in 1706, he determined to attack on the side of Montalban, contrary to the advice of Vauban, and even to the orders of the king. Having a very small army at his disposal, he began by securing his camp. This he did by constructing redoubts upon the heights that shut in the space between the Var and the Paillon, two rivers which supported his flanks. By this means, he protected himself against a surprise; for the Duke of Savoy, having the power of debouching suddenly by the Col de Tende, it was necessary that the marshal should be enabled to assemble his forces, so as to move rapidly upon his adversary, and fight him before he got into position; otherwise his inferiority in numbers would have obliged him to raise the siege.

When Marshal Saxe was besieging Brussels, with only twenty-eight thousand men, opposed to a garrison of twelve thousand, he received intelligence that the Prince of Waldeck was assembling his forces to raise the siege. Not being strong enough to form an army of observation, the marshal reconnoitred a field of battle on the little river Voluve, and made all the necessary dispositions for moving rapidly to the spot, in case of the approach of the enemy. By this means he was prepared to receive his adversary without discontinuing the operations of the siege.