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 4. DISTRIBUTION IN DEPTH AND FRONTAGE OF COMBAT FORMATIONS.

The infantry combat is decided by the combined action of long firing lines. Retained forces, not launched against the enemy for the purpose of crushing him, exert no influence whatever on the decision, since they only increase losses without contributing to the fire effect. In the battles of the past, distribution in depth at the decisive stage of the combat (unless necessary as a measure of precaution, in securing the flanks, for example), was only permissible so long as the short range of the weapons allowed reserves to be kept in readiness so close to the firing line that they could assault en masse at once and without any diminution of their strength. The deciding factor, which rested in retained reserves during the Napoleonic era, lies at present in the firing line.

Distribution in depth ''is, therefore, only a means to an end; an expedient made use of to maintain a dense firing line permanently at a constant strength; to give the firing line the impetus for the assault; to protect it against a reverse; and to secure its flanks. Victory is assured only by the simultaneous employment of superior fighting forces. A force should go into action in a deep combat formation, but it must extend its front during the fight.'' To launch an insufficient number of troops for combat and to reinforce them gradually is a fatal error, as we are thereby compelled to fight a superior force continually with an inferior one, without being able to take advantage of the superiority which we may actually possess.

The Russian attacks in the battles around Plevna are very instructive in this respect. On July 30th, 1877, the Grivica intrenchments were