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 the state of the fight may, at the outset, invite a more rapid extension of front.

9. EXTENDED ORDER.

Combats are begun and carried out in extended order. The defender can be induced to disclose his dispositions, to occupy his position, and to open fire, only by the advance upon him of a skirmish line. The deployment of a thin firing line will frequently suffice to furnish the commander of the attacking force with a clue to the strength of the force holding the hostile position. In close country, skirmishers are pushed forward primarily to guard against surprise the force which sends them out, but when thrown forward only a few hundred meters in open country, such skirmishers are unable to furnish protection. The strength and density of a firing line (by means of which the fight is sustained) depend upon marksmanship, upon the purpose of the action, and upon the terrain. The poorer the marksmanship or the weapon, or the more unfavorable the field of fire, the greater the number of skirmishers needed (i.e., the denser the firing line). If the enemy is merely to be kept at a distance, less skirmishers (i.e., a thinner firing line furnished with plenty of ammunition) will be required, than if the action is to be carried to a decisive conclusion.

Cohesion and order are best maintained, and the least time is lost in action, if efficient, dense firing lines are led forward as units up to the moment of opening fire. (Pars. 169, 321, 334 and 413 German I. D. R.). But on open terrain such dense firing lines would begin to suffer too great a loss at ranges at which they could not reply to the fire. Nothing remains then but to cover the available front with a very