It is called a 'march-in-line' whenever a phalanx marches and has its leaders [drawn] from the left or from the right.[1] And if it has its leaders from the left it is called a 'left march-in-line;' if from the right, 'right march-in-line.' But whether the march occurs in march-in-column[2] or in march-in-line, it will proceed in single-front [or double-front][3] or triple-front or quadruple-front deployment. [It will be] in single-front, whenever it is threatened from one direction; in double-front, whenever from two directions; in triple-front, whenever from three; in quadruple-front, whenever the enemy is suspected to attack from all directions.