[516]. Assignment of front to units. The commander assigns to subordinates the front to be occupied by them. These, in turn, subdivide the front among their next lower units in the firing line. (502)
[517]. Division of extended position into sections. An extended position is so divided into sections that each has, if practicable, a field of fire naturally made distinct by the terrain.
Unfavorable and unimportant ground will ordinarily cause gaps to exist in the line. (503)
[518]. Size of units occupying sections; battalions to be kept intact. The size of the unit occupying each section depends upon the latter's natural strength, front, and importance. If practicable, battalions should be kept intact and assigned as units to sections or parts of sections. (504)
[519]. Adjoining sections or machine guns to cover dead space. Where important dead space lies in front of one section, an adjoining section should be instructed to cover it with fire when necessary, or machine guns should be concealed for the like purpose. (505)
[520]. Advanced posts and other dispersion to be avoided. Advanced posts, or any other form of unnecessary dispersion, should be avoided. (506)
[521]. Position itself not fully occupied until infantry attack begins. Unless the difficulty of moving the troops into the position be great, most of the troops of the firing line are held in rear of it until the infantry attack begins. The position itself is occupied by a small garrison only, with the necessary outguards or patrols in front. (507)
[522]. Fire alone unable to stop attack. Fire alone can not be depended upon to stop the attack. The troops must be determined to resort to the bayonet, if necessary. (508)
[523]. Steps to be taken if night attack is expected. If a night attack or close approach by the enemy is expected, troops in a prepared position should strengthen the outguards and firing line and construct as numerous and effective obstacles as possible. Supports and local reserves should move close to the firing line and should, with the firing line, keep bayonets fixed. If practicable, the front should be illuminated, preferably from the flanks of the section. (509)
[524]. Short range fire and bayonet in night attack. Only short range fire is of any value in resisting night attacks. The bayonet is the chief reliance. (See Night Operations [pars. 580]–590.) (510)