Obstacles

in a military sense, are narrow pa es, woods, bridges, or any other impediments, which present themselves when a battalion is marching to front or rear. These are pa ed, by the formation, march, and deployment of the close column. Such parts as are not interrupted still move on in front; such parts as are interrupted, double by divisions, as ordered, behind and adjoining a flank or flanks, and in this manner follow in close column in their natural order. As the ground opens they succe ively deploy, and again perfect the line. The columns are always behind the line, and march closed up. The formed part of the battalion, whether advancing or retiring, continues to move on at the ordinary pace, and in proportion as the obstacles increase or diminish, will the formed or column parts of the line increase or diminish. The general attentions directed to be observed on these occasions are, that the columns formed shall be of sub-divisions, if the ground will admit. The first sub-division that is obliged to double, will be directed to which hand by the commander of the battalion, the others, as they succe ively double, will, in consequence, place themselves behind it, and behind each other, and the hand first doubled to, will be that which presents the opening most favorable to the subsequent march, and formation, and which the commanding officer will always hold in view, and order accordingly. The interrupted body will double to one or both flanks, according to circumstances, and the order it receives. Obstacles that impede a flank will occasion a single column to be formed from the flank towards the centre. Obstacles that impede the centre, or a central part of a wing, will, if considerable, occasion two columns to be formed, from the centre towards the flanks. The columns will follow a flank of such part of the line as is not impeded; and either in doubling into column, or extending into line, the rear divisions will conform to the movements of their then leading one. No part le than the front of the column doubles or moves up, and when half or more of a battalion must be thrown into one column, it will be ordered by companies.