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The defense may repulse the enemy, but only the attack can annihilate him. The decision as to whether the force is to attack or stand on the defensive depends upon the tactical situation and the will of the commander, and not upon numerical superiority, of which one is not aware, as a rule, until after the battle. Determined attacks, again and again repeated, in spite of all failures, are the surest means of gaining victory and of preventing the enemy from becoming aware of his superiority. Only pressing reasons (marked hostile superiority, necessity for awaiting approaching reinforcements, or the failure of an attack), and never favorable terrain conditions, should determine a commander to stand on the defensive. In defense the eventual assumption of the offensive is kept constantly in view. A commander who voluntarily stands on the defensive for the purpose of letting the opponent attack, and then attacks him in turn, reaps only the disadvantages and never the advantages of both the offensive and the defensive.

The attack may take various forms, depending upon whether the dispositions have to be made under hostile fire (surprise and rencontre), or whether the enemy has renounced the initiative and awaits the attack in a deployed formation, or in a position prepared for defense (deliberately planned attack). In the last case the attack requires more careful preparation and in many instances even necessitates the employment of special auxiliaries (such as guns capable of high angle fire, and engineer trains). However, the advance of a strong firing line to within assaulting distance of the enemy, and the uninterrupted fight for the superiority of fire, are common to all attacks.