Counter attacks are those which are made upon an enemy who exposes himself anywhere in the theatre of his offensive operations. It is this form of attack which constitutes what Clausewitz calls the "surprise advantage of defence."

Diversions are similar operations undertaken against an enemy outside the limit of his theatre of offensive operations.

Diversions are designed to confuse his strategy, to distract his attention, and to draw off his forces from his main attack. If well planned, they should divert a force greater than their own. They should, therefore, be small. The nearer they approach the importance of a real attack the less likely they are to divert a force greater than their own.

Diversions involve a breach of the law of concentration, and it is only their power of diverting or containing a larger force than their own that justifies their use.

This power depends mainly on suddenness and mobility, and these qualities are most highly developed in combined expeditions.

Diversions must be carefully distinguished from eccentric attacks. Eccentric attacks are true offensive movements. They have a positive object, i.e., they aim to acquire something from the enemy; whereas diversions have a negative object, i.e., they aim at preventing the enemy doing or acquiring something. Eccentric attacks are usually made in greater force than diversions.

Examples.—Diversion.—Our raid on Washington in 1815. Landing force, about 4,000 men. Object, according to official instruction, "a diversion on the coasts of United States of America in favour of the army employed in the defence of Canada"; i.e., the intention was negative—preventive—defensive. Eccentric Attack.—Operations against New Orleans in 1815. Intended force, 15,000 to 20,000 men. Object, "to obtain command of the embouchure of the Mississippi, and, secondly, to occupy some important and valuable possession, by the restoration of which the conditions of peace might be improved, &c."; i.e., the intention was positive—to acquire. Compare Rochefort Expedition (diversion) with those against Martinique and Belleisle (eccentric attacks) in the Seven Years' War.

This distinction gives a threefold classification of combined expeditions, as used by Elizabethan strategists, viz., raids, incursions, and invasions. These correspond respectively with our modern diversions, eccentric attacks, and true direct offensive.

LIMITED AND UNLIMITED WARS

From the nature of the ulterior object we get an important classification of wars, according to whether such object is limited or unlimited.

(1) War with limited object ("limited war") is where the object is merely to take from the enemy some particular part of his possessions or interests; e.g., Spanish-American War, where the object was the liberation of Cuba.

(2) War with an unlimited object is where the object is to overthrow the enemy completely, so that to save himself from destruction he must agree to do our will (become subservient); e.g., Franco-German War.

PLANS OF WAR

System of Operations

Having determined the nature of the war by the nature of its object (i.e., whether it is offensive or defensive and whether it is limited or unlimited), Strategy has to decide on the system of operations or "plan of the war."

Apart from the means at our disposal a plan of war depends mainly upon—

(1) The theatre of the war.

(2) The various theatres of operation available within it.

1. Theatre of the War.—Usually defined as "All the territory upon which the hostile parties may assail each other." This is insufficient. For an Island Power the theatre of war will always include sea areas. Truer definition: "Geographical areas within which must lie the operations necessary for the attainment of the ulterior objects of the war and of the subordinate objects that lead up to them."

A "theatre of war" may contain several "theatres of operations."

2. Theatre of Operations.—Is generally used of the operations of one belligerent only.

An "operation" is any considerable strategical undertaking.

A "theatre of operations" is usually defined as embracing all the territory we seek to take possession of or to defend.

A truer definition is: "The area, whether of sea or land or both, within which the enemy must be overpowered before we can secure the object of the particular operation."

Consequently, since the nature of the war varies with the object, it may be defensive in one theatre of operations and offensive in another.

Where the operations are defensive in character any special movement or movements may be offensive.

As the plan of war determines the theatres of operation in the theatre of war, so in each theatre of operation it determines the lines of operation and the objectives.

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