Each element in rear of the base, leaves the column by a movement approximating a right oblique and proceeds (par. 375) to a place abreast of the leading element, the elements taking successively, from left to right in the new line, positions in the same order as that in which they previously appeared from head to rear in the column. The guide of the leading element, when the movement begins, acts as directing guide (Def.) of the squad from the moment the leader starts to his new position until he indicates the guide of the new line (pars. 326, 373) when all regulate on the latter guide. Gaits are regulated as in pars. 337-_a_, _b_. (Fig. 34.) _This is one of the movements referred to in par. 468-b._ In the dismounted execution of the movement at quick time the leader commands: 1. =Squad=, 2. =HALT=, as soon as the leading element has advanced to the point where it is desired that the line shall form (par. 339-_a_, _b_, _c_). Only the leading (base) element halts at the command, each rear element halting as it arrives on the line (par. 337-_f_). If executed while marching in double time, the leader similarly commands: 1. =Quick time=, 2. =MARCH=, the reduced gait being taken successively by the elements as they reach their positions (par. 337-_f_). If marching in quick time, and =double time= be included in the command, the command for the increased gait applies only to the rear elements (par. 337-_f_). [Illustration: FIG. 40, par. 397.] =398.= To prevent the inversion of twos or troopers in their respective fours the squad in =column of twos or column of troopers= should form line to the left front when the squad is right in front (par. 370), and vice versa. =399.= =Being in column of twos or troopers, to form column of fours=: 1. =Column=, 2. =MARCH.= (_See_ Def. =Column=.) The leading element is the base and follows the leader. =If in column of twos= the rear two of the leading four obliques at a correspondingly faster gait (par. 335) and takes its proper place abreast of, and to the _right or left_ of, the leading two of that four, so that the troopers of the four shall appear from right to left, in the order of their respective numbers. All the other twos take up a correspondingly faster gait than the leading two, and the fours form successively from head to rear in the column in the manner indicated above (par. 331). The leading two of each four, other than the leading four, takes the gait of the head of the column (or halts) when at 4 feet from the corresponding two of the four next in front. In each four the rear two begins to oblique as the leading two of that four approaches the position where it decreases the gait (or halts). The leader takes position in front of the guide of the column (No. 2). Gaits are further regulated as in movements from column into line (par. 337-_a_, _b_). =Column of fours, from column of troopers= is formed by the same commands and in accordance with the same principles.