If the squad be mounted in column of fours; the third and fourth commands are omitted. At the first command the troopers of each four open out fanwise, Nos. 1 and 2 to the right, Nos. 3 and 4 to the left. Nos. 1 and 4 open out a little more than Nos. 2 and 3, all opening only enough to permit the troopers to mount without interfering with each other. The troopers habitually straighten their horses in the column as soon as they have mounted, but this requirement may be relaxed whenever mounting in unison is not required (par. 358). The squad in =column of twos= is mounted by commands and methods conforming to those used for mounting from column of fours. =355.= The preparatory oral command for mounting may be omitted. The squad then executes at the command =MOUNT= all the movements prescribed in par. 354 for the commands, 1. =Prepare to mount=, 2. =MOUNT.= The troopers mount promptly, but not =in unison=. The preparatory _signal_ for mounting, when followed _immediately_ by the signal of execution, will be understood as equivalent to the oral command =MOUNT=, and will be executed accordingly. =356.= The squad being in line, the habitual commands for dismounting are: 1. =Prepare to dismount=, 2. =DISMOUNT=; 3. =Form=, 4. =RANK.= At the first command the odd numbers ride 4 yards directly to the front, regulating on the right, and all the troopers execute the movements and take the final position prescribed in par. 192-_a_. At the second command the troopers execute, simultaneously, the movements prescribed in par. 192-_b_. At the fourth command the even numbers lead into their intervals in the rank. The third and fourth commands are given only in case it is desired to form rank. The squad may be dismounted and, without forming rank, execute =rest= or =at ease= (par. 359), or be inspected, mounted, or dismissed. The modifications indicated for dismounting in column of fours and column of twos correspond to those prescribed in par. 354 for mounting from the corresponding formation, except that the horses are not habitually straightened in the column after dismounting unless the dismounted squad moves forward (the troopers leading their horses). =357.= The preparatory oral command for dismounting, may be omitted. The squad then executes at the command =DISMOUNT= all the movements prescribed in par. 356 for the commands: 1. =Prepare to dismount=, 2. =DISMOUNT.= The troopers dismount promptly but not in unison. The preparatory _signal_ for dismounting, when followed _immediately_ by the signal of execution, will be understood as equivalent to the oral command =DISMOUNT=, and will be executed accordingly.