Deploy. To extend the front. A squad deploys when it goes "As skirmishers." A company likewise deploys when it goes from column into line.
File. Two men, the front rank man and the corresponding man in the rear rank. The front rank man is the file leader. A file which has no rear rank man is a blank file.
Interval. Space between elements of the same line. The interval between men in ranks is 4 inches and is measured from elbow to elbow. It is to get this interval that each man is required to raise his arm when the company is formed.
Distance. Space between elements in the direction of depth. It is measured from the back of the man in front to the breast of the man in rear. The rear rank when in line or column is 40 inches from the front rank.
The guide of a squad in line is right unless otherwise announced.
The guide of a squad deployed, (i.e., skirmishers) is center unless otherwise announced.
TO FORM THE SQUAD
To form the squad the instructor places himself 3 paces in front of where the center is to be and commands: Fall in.
The men assemble at attention, pieces at the order, and are arranged by the corporal in double rank, as nearly as practicable in order of height from right to left, each man dropping his left hand as soon as the man on his left has his interval. The rear rank forms with distance of 40 inches.
The instructor then commands: Count off.