Plans of campaign may be modified ad infinitum according to circumstances—the genius of the general, the character of the troops, and the topography of the theatre of action.
NOTE.
Sometimes we see a hazardous campaign succeed, the plan of which is directly at variance with the principles of the art of war. But this success depends generally on the caprice of fortune, or upon faults committed by the enemy—two things upon which a general must never count. Sometimes the plan of a campaign, although based on sound principles of war, runs the risk of failing at the outset if opposed by an adversary who acts at first on the defensive, and then, suddenly seizing the initiative, surprises by the skilfulness of his manœuvres. Such was the fate of the plan laid down by the Aulic council for the campaign of 1796, under the command of Marshal Wurmser. From his great numerical superiority, the marshal had calculated on the entire destruction of the French army, by cutting off its retreat. He founded his operations on the defensive attitude of his adversary, who was posted on the line of the Adige, and had to cover the siege of Mantua, as well as central and lower Italy.
Wurmser, supposing the French army fixed in the neighborhood of Mantua, divided his forces into three corps, which marched separately, intending to unite at that place. Napoleon, having penetrated the design of the Austrian general, perceived the advantage to be derived from striking the first blow against an army divided into three corps, with no communication between them. He hastened, therefore, to raise the siege of Mantua, assembled the whole of his forces, and by this means became superior to the imperialists, whose divisions he attacked and beat in detail. Thus Wurmser, who fancied he had only to march to certain victory, saw himself compelled, after ten days campaign, to retire with the remains of his army into the Tyrol, after a loss of twenty-five thousand men in killed and wounded, fifteen thousand prisoners, nine stand of colors, and seventy pieces of cannon.
Hence, nothing is so difficult as to prescribe beforehand to a general the line of conduct he shall pursue during the course of a campaign. Success must often depend on circumstances that cannot be foreseen; and it should be remembered, likewise, that nothing cramps so much the efforts of genius as compelling the head of an army to be governed by any will but his own.
MAXIM III.
An army which undertakes the conquest of a country, has its two wings resting either upon neutral territories, or upon great natural obstacles, such as rivers or chains of mountains. It happens in some cases that only one wing is so supported; and in others that both are exposed.
In the first instance cited, viz., where both wings are protected, a general has only to protect his front from being penetrated. In the second, where one wing only is supported, he should rest upon the supported wing. In the third, where both wings are exposed, he should depend upon a central formation, and never allow the different corps under his command to depart from this: for if it be difficult to contend with the disadvantage of having two flanks exposed, the inconvenience is doubled by having four, trebled if there be six—that is to say, if the army is divided into two or three different corps. In the first instance, then, as above quoted, the line of operation may rest indifferently on the right or on the left. In the second, it should be directed toward the wing in support. In the third, it should be perpendicular to the centre of the army’s line of march. But in all these cases it is necessary, at a distance of every five or six days march, to have a strong post or an entrenched position upon the line of operation, in order to collect military stores and provisions, to organize convoys, to form of it a centre of movement, and establish a point of defence to shorten the line of operation of the army.
NOTE.
These general principles in the art of war were entirely unknown, or lost sight of, in the middle ages. The crusaders in their incursions into Palestine appear to have had no object but to fight and to conquer, so little pains did they take to profit by their victories. Hence, innumerable armies perished in Syria, without any other advantage than that derived from the momentary success obtained by superior numbers.
It was by the neglect of these principles, also, that Charles XII, abandoning his line of operation and all communication with Sweden, threw himself into the Ukraine, and lost the greater part of his army by the fatigue of a winter campaign in a barren country destitute of resources.
Defeated at Pultawa, he was obliged to seek refuge in Turkey, after crossing the Nieper with the remains of his army, diminished to little more than one thousand men.
Gustavus Adolphus was the first who brought back the art of war to its true principles. His operations in Germany were bold, rapid, and well executed. He made success at all times conducive to future security, and established his line of operation so as to prevent the possibility of any interruption in his communications with Sweden. His campaigns form a new era in the art of war.
MAXIM IV.
When the conquest of a country is undertaken by two or three armies, which have each their separate line of operation, until they arrive at a point fixed upon for their concentration, it should be laid down as a principle, that the union of these different corps should never take place near the enemy; because the enemy, in uniting his forces, may not only prevent this junction, but may beat the armies in detail.
NOTE.
In the campaign of 1757, Frederick, marching to the conquest of Bohemia with two armies, which had each their separate line of operation, succeeded, notwithstanding, in uniting them in sight of the Duke of Lorraine, who covered Prague with the imperial army; but his example should not be followed. The success of this march depended entirely on the inaction of the duke, who, at the head of seventy thousand men, did nothing to prevent the junction of the two Prussian armies.
MAXIM V.
All wars should be governed by certain principles, for every war should have a definite object, and be conducted according to the rules of art. (A war should only be undertaken with forces proportioned to the obstacles to be overcome.)
NOTE.
It was a saying of Marshal Villars, that when war is decided on, it is necessary to have exact information of the number of troops the enemy can bring into the field, since it is impossible to lay down any solid plan of offensive or defensive operation without an accurate knowledge of what you have to expect and fear. “When the first shot is fired,” observes Marshal Villars, “no one can calculate what will be the issue of the war. It is, therefore, of vast importance to reflect maturely before we begin it.” When once, however, this is decided, the marshal