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The invariable guiding principle in defense is to make the most profitable use of fire. This principle governs in the selection of a position and in strengthening it artificially.

The defender's object may be—

1. Temporary occupation of a piece of ground;

2. Purely passive defense, outpost, rear guard, and delaying actions;

3. Offensive-defensive action, i.e., to bring about a decision by combining the offensive with the defensive.

In fortress warfare, situations may arise which may make it necessary to hold a piece of ground obstinately, without it being possible to assume the offensive. In the French, Russian, and Italian regulations, only the offensive-defensive is considered. The Italians see in the defensive nothing but a preparation for the offensive; the Russians seek to shake the enemy with fire in defense, so that they can subsequently assume the offensive.

The defensive is dependent upon the terrain, and is subject to the condition that the locality where the tactical situation requires a stand to be made offers a position favorable for employing fire to good advantage, and that the opponent actually attacks where the defender expects him. The employment of the defensive is restricted by its dependence on the ground and on the measures of the enemy. Its employment may frequently be explained by the fact that one of the contending parties allows itself to be checked to such an extent by the initiative of the other that it can only offer a passive resistance. Such passive resistance may here and there score