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 The firing line will, therefore, frequently have to take the initiative in bringing about the assault. It is absolutely necessary, especially if the enemy evacuates the position, that the firing line, quickly taking advantage of this moment, pass over to the bayonet attack. If the firing line were to wait until the reserves are up, valuable time would be lost, under certain circumstances; the enemy might recover from his temporary bewilderment and re-form, or might even receive reinforcements. In addition, hesitation on the part of the attacker would enable the enemy to gain time, evacuate the position unmolested, retire in good order, and perhaps take up a new position, or at least evade quickly the pursuing fire of the assailant. The firing line would be the first, in such a case, to perceive when and where the resistance of the enemy abates; it should therefore make the most of this knowledge and throw itself upon the part of the defender's force that is in the act of withdrawing.

When the impulse for the assault emanates from the firing line, there is danger that instead of a general attack only a local one will result. It is impossible to conceive that the whole firing line will simultaneously consider that the moment for the assault has arrived; in general, only a part of that line at a time will come to this conclusion. Such local attacks are hazardous, however, and have some chance of succeeding only in covered terrain. A local assault made by a single battalion or company will usually attract the fire of a considerable portion of the hostile line and quite naturally dash itself to pieces against it. Even assuming that a gallantly charging unit succeeds in unexpectedly penetrating the hostile line at some one point, the defender will at once attack it in vastly superior force and compel it to retire with heavy loss. Furthermore, the failure is usually not confined to the one unit. The troops on the right and left of it, although they are perhaps farther from the enemy, and have not yet shaken him sufficiently by their fire, nevertheless join in the assault, as soon as they see the first unit rush forward. As a rule,