To advance the firing line in attack, all means are good: by section, half-section, squad, the only condition being that it be by commanded fractions. 160.--Closing in to replace casualties. As men fall, the rest close in toward the section leader, the sections rectifying intervals on the sections furthest advanced (the captain is with this section, all sections being now in line.) 161.--Closing in on the battalion front. The several companies rectify intervals in the same way on the furthest advanced company (the battalion commander being with this company). 162.--Seize every opportunity to advance. Every propitious occasion to advance should be seized at once by the various elements of the line: greater effectiveness of the neighboring section's fire, slackening fire of the enemy, effects of artillery, etc. 163.--Each fraction protects advance of neighbor. The movement forward of each fraction of the line should be protected by the fire of the neighboring fraction. 164.--Keep fit to fire accurately. The fraction leader, after each rush forward, should give time to the men to get back their breath so that they may fire with careful aim. 165.--Liaison with the Captain. The captain should be kept informed by a conventional signal as to the need of ammunition, etc. USE OF MACHINE GUNS IN THE ATTACK. 166.--During the Approach. Use them judiciously but boldly. They should advance as first units. 167.--During the fire attack. Strive to keep abreast or ahead of the most advanced elements especially on the flanks. 168.--During the charge. Try to have them reach the objective with the firing line and contribute to the pursuit. THE COMPANY SUPPORTS. 169.--In liaison with the captain. The sections kept in support are at the disposition of the captain. 170.--Method of advance. Under the command of the section leader, they advance, in double file, at proper intervals or deployed, according to their proximity to the enemy and according to the terrain (covered or uncovered). 171.--Distance from the firing line. They should be about 250 yards behind the firing line to whose movements they conform. 172.--Supplying the firing line. The section leaders keep in sight of the captain and upon his signaled command advance into the firing line either to fill up a gap or to reinforce a section. 173.--When filling a gap. They advance as far as possible ahead of the line. 174.--Reinforcing. They come up with a rush and shout to rehearten the line. THE COMPANIES IN SUPPORT. 175.--Position. They are kept out of range of the enemy's fire upon the firing line but near enough to interfere as soon as called upon. 176.--Liaison with battalion commander. The captains keep in touch with the battalion commander. 177.--Advance into action.