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 the regiments are formed side by side, two adjacent independent sections are created, each commanded by a regimental commander; this insures better supervision, better control, and a more energetic conduct of the action, since the first line can be reinforced by troops belonging to the same organization. This formation, moreover, facilitates tactical combinations. It may, however, be a disadvantage that the first line is not subject to the orders of a single commander; that it is difficult to employ the reserve battalions in one body; and that the brigade commander can influence the action only by withdrawing units from the regiments for the purpose of forming a reserve. The echelon formation, each echelon consisting of a regiment, is frequently used in rencontres, because troops are thrown into action directly from route column. The regimental commanders then become leaders of echelons, the first line cannot be reinforced by its own troops, and the organizations of different regiments finally become mixed. The echelon formation is proper only when the second line is intended to be used independently abreast of the first in the course of the action; for example, on a flank, for the purpose of making or warding off a flank attack. When part of a larger force, the most suitable combat formation for troops is usually the one in which the regiments are formed side by side.

The disadvantages of the echelon formation, when taken up from route column, can be obviated by deploying the second regiment in rear of a flank of the first. It should be kept intact in that position until the decisive moment, although