Infantry Drill Regulations, United States Army, 1911 Part 21

340. To a.s.sume any formation, the colonel indicates to the majors the character of the formation desired, the order of the battalions, and the point of rest. Each battalion is conducted by its major, and is placed in its proper order in the formation, by the most convenient means and route.

Having halted in a formation, no movements for the purpose of correcting minor discrepancies in alignments, intervals, or distances are made unless specially directed by the colonel or necessitated by conditions of cover.

341. To correct intervals, distances, and alignments, the colonel directs one or more of the majors to rectify their battalions. Each major so directed causes his battalion to correct its alignment, intervals, and distances, and places it in its proper position in the formation.

_COMBAT PRINCIPLES._

342. The regiment is deployed by the colonel's order to the commanders of battalions and special units. The order should give them information of the situation and of the proposed plan of action. In attack, the order should a.s.sign to each battalion not in reserve its objective or line of advance. In defense, it should a.s.sign to each its sector. In either case it should designate the troops for, and the position of, the reserve and prescribe the employment of the machine guns and mounted scouts.

Both in attack and defense the order may fix the front to be covered in the deployment.

Encroachment upon the proper functions of subordinates and unnecessary details should be studiously avoided. When the regiment deploys, the colonel habitually places the band at the disposal of the surgeon for employment in caring for the wounded. (_C.I.D.R., No. 2._)

343. The regiment, when operating alone and attacking, should undertake an enveloping attack if it does not result in overextension.

a.s.suming a regiment of 1,500 rifles, an extension of more than 1,000 yards between its extreme flanks when making an enveloping attack alone is seldom justifiable; when part of a battle line, a front of 500 yards can rarely be exceeded.

344. In defense the front occupied when acting alone or posted on or near the flank of a battle line should seldom exceed 600 yards; when posted as an interior regiment, the front may be increased to 800 yards. The front may be somewhat longer than in the attack, since smaller battalion supports are justifiable. When the regiment is operating alone, however, the regimental reserve should be as strong in the defense as in the attack unless the flanks are secure.

345. The colonel should always hold out a reserve--generally one battalion; but when the regiment is operating alone, it is generally advisable to hold out more at first.

346. Whereas the support held out in each battalion of the firing line is intended to thicken the diminishing firing line at the proper times and sometimes to lengthen it, the reserve held out in a regiment operating alone is used for this purpose only as a last resort. Its primary functions are: In attack, to protect the flanks, to improve fully the advantage following a victory, or to cover defeat; in defense, to prolong the firing line, to effect a counterattack, or to cover withdrawal. It is the colonel's chief means of influencing an action once begun. It should be conserved to await the proper moment for its employment; the combat will seldom come to a successful issue without its employment in some form.

The reserve of a regiment operating as part of a large force becomes a local reserve. It replaces depleted supports and in attack strengthens and protects the firing line in the charge.

THE BRIGADE.

347. The brigade does not engage in prescribed drills. It engages in route marches and battle or other tactical exercises. These are conducted pursuant to commands or orders formulated to suit the conditions of the proposed movement or exercise, and, in general, in accordance with the principles applicable to the regiment.

348. A brigade of about 4,000 rifles, as part of a general battle line, would be deployed on a front of not more than 1,200 yards in attack or 1,600 yards in defense.

When acting alone the distance between extreme flanks in an enveloping attack should not exceed 2,000 yards at the time the attacking infantry opens fire.

When acting alone, the front in defense should not exceed 1,600 yards.

These limits apply to the original deployment of the brigade for combat and presuppose an enemy of equal or nearly equal training and morale. The limits necessitated by the subsequent progress of the combat can not be foreseen.

349. Units larger than the brigade are generally composed of all arms.

Combined tactics are considered in the Field Service Regulations.

PART II.--COMBAT.

INTRODUCTION.

350. Part II of these regulations treats only of the basic principles of combat tactics as applied to infantry and to the special units, such as machine guns and mounted scouts, which form a part of infantry regiments and battalions.

The combat tactics of the arms combined are considered in Field Service Regulations.

351. Modern combat demands the highest order of training, discipline, leadership, and morale on the part of the infantry. Complicated maneuvers are impracticable; efficient leadership and a determination to win by simple and direct methods must be depended upon for success.

352. The duties of infantry are many and difficult. All infantry must be fit to cope with all conditions that may arise. Modern war requires but one kind of infantry--good infantry.

353. The infantry must take the offensive to gain decisive results.

Both sides are therefore likely to attempt it, though not necessarily at the same time or in the same part of a long battle line.

In the local combats which make up the general battle the better endurance, use of ground, fire efficiency, discipline, and training will win. It is the duty of the infantry to win the local successes which enable the commanding general to win the battle.

354. The infantry must have the tenacity to hold every advantage gained, the individual and collective discipline and skill needed to master the enemy's fire, the determination to close with the enemy in attack, and to meet him with the bayonet in defense. Infantry must be trained to bear the heaviest burdens and losses, both of combat and march.

Good infantry can defeat an enemy greatly superior in numbers, but lacking in training, discipline, leadership, and morale.

355. It is impossible to establish fixed forms or to give general instructions that will cover all cases. Officers and noncommissioned officers must be so trained that they can apply suitable means and methods to each case as it arises. Study and practice are necessary to acquire proper facility in this respect. Theoretical instruction can not replace practical instruction; the former supplies correct ideas and gives to practical work an interest, purpose, and definiteness not otherwise obtainable.

356. After the mechanism of extended order drill has been learned with precision in the company, every exercise should be, as far as practicable, in the nature of a maneuver (combat exercise) against an _imaginary_, _outlined_, or _represented_ enemy.

Company extended order drill may be conducted without reference to a tactical situation, but a combat exercise, whatever may be the size of the unit employed, should be conducted under an a.s.sumed tactical situation.

357. An effective method of conducting a combat exercise is to outline the enemy with a few men equipped with flags. The umpire or inspector states the situation and the commander leads his troops with due regard to the a.s.sumptions made.

Changes in the situation, the results of reconnaissance, the character of artillery fire, etc., are made known to the commander when necessary by the umpire or inspector, who, in order to observe and influence the conduct of the exercise, remains in rear of the firing line. From this position he indicates, with the aid of prearranged signals, the character of the fire and movements of the hostile infantry. These signals are intended for the men outlining the enemy.

These men repeat the signals; all officers and men engaged in the exercise and in sight of the outlined enemy are thus informed of the enemy's action and the exercise is conducted accordingly.

a.s.sistant umpires, about one for each company in the firing line, may a.s.sist in indicating hostile fire and movements and in observing the conduct of the exercise.

An outlined enemy may be made to attack or defend.

Situations should be simple and natural. During or after the exercise the umpire or inspector should call attention to any improper movements or incorrect methods of execution. He will prohibit all movements of troops or individuals that would be impossible if the enemy were real. The slow progress of events to be expected on the battle field can hardly be simulated, but the umpire or inspector will prevent undue haste and will attempt to enforce a reasonably slow rate of progress.

The same exercise should not be repeated over the same ground and under the same situation. Such repet.i.tions lead to the adoption of a fixed mode of attack or defense and develop mere drill masters. Fixed or prearranged systems are prohibited.

LEADERSHIP.

_General Considerations._