=Column of twos from column of troopers= is formed in a similar manner at the commands: 1. =Column of twos=, 2. =MARCH.= The column of twos will be right in front or left in front (par. 370), according as the column of troopers was right in front or left in front prior to the movement. In the dismounted execution of the above movements in quick time the leader habitually commands: 1. =Squad=, 2. =HALT=, immediately following the command of execution (par. 339-_b_, _c_). Only the leading element halts (par. 339-_f_), each of the rear elements halting when it reaches its prescribed position in the column. If executed in =double time= the leader similarly follows the command of execution by the command for =quick time= (par. 339-_b_, _c_), which is successively taken by the elements, as above. If marching in =quick time=, and =double time= be commanded, only the rear elements take the increased gait, each taking =quick time= on arriving in its place. (Fig. 41.) [Illustration: FIG. 41, par. 399.] =400.= =Being in column of fours, twos, or troopers, to form line to a flank=: 1. =Fours right (left)=, 2. =MARCH.= Each, four turns to the right (par. 389). Each rear four regulates on the leading four until the fours unite in line (par. 326), when, unless the leader halts the squad, all take up the march in the new direction _without further command_, regulating on the new guide (pars. 325, 372). If the squad is to form line without advancing in the new direction, the leader gives the preparatory indication for the halt immediately following the second command, so as to add the command halt as the four unite in line. =In an emergency= a similar movement may be executed from =columns of twos= at the commands: 1. =Twos right (left)=, 2. =MARCH.= Loss of =order= may result. In the absence of other indication, intervals are closed toward the guide (par. 372). A similar movement executed from column of troopers results in a line of foragers, which may be assembled or rallied to form line (pars. 414, 416). Gaits are regulated as in par. 337-_d._ (Fig. 36.) [Illustration: FIG. 42, par. 400.] =401.= =Being in line, to face or march the line to the rear=: 1. =Fours right (left) about=, 2. =MARCH.= When the movement is executed by =signal= the elements of the column always turn to the _left_ about. The oral command =fours right about= is not accompanied by an arm signal. Each four turns 180 degrees in the direction indicated (par. 389). The leader, passing around a flank of the squad, promptly takes position in front of the guide so as to lead the squad in the new direction (pars. 325, 372). To face to the rear, the squad is halted as the fours unite in line. The modifications incident to the execution of the dismounted movement are indicated in par. 391. Gaits are regulated as in par. 337-_d_. A dismounted squad may also be marched a short distance to the rear by the _oral_ command and methods indicated in par. 82.