15. Artillery co-operates more closely than ever with infantry. Its reconnaissance officers accompany infantry lines in order to obtain information. _There is a certain number of artillery observers attached to each battalion of infantry_.

The general method of attack is to smother the defense with a torrent of explosive sh.e.l.ls, kept up incessantly for one or more days, and shatter the defense so they will offer but slight resistance to the infantry; then rush forward with the infantry and seize the positions while the enemy is demoralized, and consolidate them before reenforcements can be brought up.

The artillery bombardment is necessary to prepare the way for the infantry advance. It has for its objects: (1) To destroy the hostile artillery, wire entanglements and infantry trenches.

(2) To produce curtains of fire and prevent bringing up reenforcements.

_Light guns are a.s.signed to_ EACH BATTALION OF INFANTRY, subject only to orders of regimental and battalion commanders concerned.

Save under exceptional circ.u.mstances the light gun is always attached to the Machine Gun Company for the attack.

The essential role of the light gun is to destroy with direct fire the visible machine guns; they are employed separately and not grouped.

The infantry is divided into two cla.s.ses: Holding troops--and attacking or shock troops. Holding troops are those doing routine or trench duty; shock troops are picked organizations of young and vigorous men and are kept in camps well behind the battle front.

Holding troops are two weeks in and two weeks out of the trenches.

All specialist groups, _i.e._, Machine Gun Companies, etc., are officered, allowing company and battalion commanders to concentrate them, if the situation requires.

_They play the normal part in combat if they do not receive special instructions._

Attack of a Defensive Position.

Unity of command in depth must be preserved everywhere, unless there is an imperative reason for doing otherwise.

The front of each regiment should be divided between two or three battalions.

_Each battalion commander having to look after a front of from 500 to 600 yards, can exercise efficient control of his command._

In preparing for an a.s.sault, seniors must take steps to organize it and make all necessary preparations themselves, and not leave all the responsibility with the juniors.

In the a.s.sault each unit must know its special task beforehand, and it should be rehea.r.s.ed in rear of the line of trenches. Each commander must know the exact time he is to start and must start on time.

The first waves of men are placed at 4 or 5 pace interval. Chief of section can command only a front of 80 to 100 paces and it is necessary to form the section in two (2) waves. The first containing the grenadiers and automatic riflemen, the latter in the center. The second wave contains the riflemen and rifle grenadiers, the latter in the center.

If the terrain is cut up by woods, villages, etc., the proportion of grenadiers may be increased by taking them from the sections in support and the automatic riflemen sent back to the second wave.

If the distance to cross exceeds 300 or 400 yards, the number of automatic riflemen should be increased.

_Two or three sections are usually placed abreast on the company front, which thus covers two to three hundred yards._

The support sections follow the leading sections of their company at about 50 yards, marching in two lines, if possible in two lines of squad columns at 20 yard intervals.

The first wave of the support is usually formed of the one-half section of specialists.

The echeloning of the specialists in front is also the most favorable formation to progress by rushes in a terrain cut up by sh.e.l.l holes.

The chief of section is between the two (2) waves of his section.

The captain is usually in front of the support sections.

The support sections are closely followed by a powerful line of machine guns, which are thrown into the fight when needed to reenforce the leading units.

"Trench Cleaners" usually march immediately after the leading sections and may be taken from the support sections. They are armed with pistols, knives and hand grenades.

The captain can use his section complete, or take out the specialists and use them for a particular purpose.

The specialists carry only the weapons of their specialty and have their loads lightened. The ordinary riflemen carry the usual packs and equipment.

Officers no longer lead the a.s.sault, but direct it. They are equipped with the rifle and bayonet, the same as the enlisted man.

Each unit of the first wave of the attack is given a definite objective. Different waves must not break upon the first wave.

Fire is opened by the a.s.saulting troops only at short ranges, the advance being protected by a curtain of artillery fire. The advancing line makes use of sh.e.l.l holes and all other available cover.

When the first section reaches its objective it is joined by the half section of riflemen; it immediately organizes the captured ground.

Attacking From Trenches.--The commanders of brigades and battalions, with the commander of the artillery detailed to support them, study on the ground the artillery plan so far as it affects them. Immediately after the advance of the infantry begins, the artillery supporting it commences an intense bombardment with the object of forcing the enemy to take cover. At the moment laid down in the table of artillery fire the barrage lifts clear of the trench and the infantry rush in and capture it. The infantry must be taught that their success depends upon their getting within 75 yards of the barrage before it lifts, in order that they may reach the trenches before the enemy can man them.

The secret of a successful a.s.sault is exact synchronization of the movements of the infantry with those of the barrage.

The pace of a barrage depends, to a certain extent, on the pace of the infantry, which varies with the condition of the ground, the length of the advance, the number of enemy trenches to be crossed, etc. It may be from 15 to 75 yards per minute. The pace of the barrage should be quicker at first, and should gradually slow down as the men become exhausted, in order to give them time to get close to the barrage and pull themselves together for the final rush.

In an attack each unit must have sufficient driving power in itself to carry it through to its objective and enable it to hold its ground when it gets there. When a number of trenches have to be carried, considerable depth will be required, and the frontage must be reduced.

A brigade usually has a front in attack of 250 to 350 yards, but this may be increased to 1,000 or 1,200 yards.

A battalion should have a front of 250 to 350 yards. The battalion must be organized in depth in a series of waves. Two companies are usually put abreast in the first line and the others in the second line. Each company in both lines attacks in column of platoons at about 50 yards' distance, with intervals of three to five paces between men, so there would be eight lines of waves, of two platoons each. The 8th and 16th platoons, the two in rear forming the eighth wave, are usually not employed in the attack, but are left behind as a nucleus to form on in case of heavy casualties.

The front line must not be less than 200 yards from the enemy's front line.

The leading two or three waves are likely to meet machine gun fire, and generally move in extended order. Not more than two waves can be accommodated in one trench. Subsequent waves will move in line or in line of section columns in single file. Russian saps must be run out as far as possible across "No Man's Land" to be opened up immediately after the a.s.sault, as approach trenches. Ladders or steps are necessary to a.s.sist the leading waves in leaving the trenches, as they must move in lines. Provision must be made for bridges over the first line trenches for the rear waves. In the original a.s.sault line will be more suitable for both leading and rear waves. In later stages it is better for the rear waves to move in small and handy columns. In the original a.s.sault the distance between waves may be 75 to 100 yards; in later stages they may follow each other at 50 yards.

In the original a.s.sault, zero, or the time for the a.s.sault to begin, may be fixed for the moment at which our barrage lifts from the enemy front trench, the infantry timing their advance so as to be close under our barrage before it lifts. In the later stages zero must be the moment at which our barrage commences, and this commencement will be the signal for the infantry to leave their trenches. Each wave is a.s.signed its own objective. All watches must be synchronized in order that all units may start off at the appointed time.

The first wave is composed of bombers and rifle grenade men, and attacks the enemy's first line of trenches. It must go straight through to its objective, following the artillery barrage as closely as possible. The second and third waves, composed of riflemen with bayonets and Lewis guns, re-enforce the first wave after the latter has occupied the enemy's first line trench, and attack the second line trench. The fourth wave takes up tools, ammunition and sand bags and a.s.sists in consolidating the line. The fifth wave is a mopping-up party to clear the enemy's dugouts. The sixth wave comprises battalion headquarters and has two Lewis guns, kept for a special purpose. The seventh and eighth waves, if used, seize and consolidate the enemy's third line trench.

Bombing squads (1 non-commissioned officer and 8 men) are on the flank of each attacking wave. Battalion bombers are a.s.signed a special task.

All movements must be over the top of the ground. The pace throughout should be a steady walk, except for the last 30 or 40 yards, when the line should break into a steady double time, finishing up the last 10 yards with a rush.

Barrage is continued 20 or 30 minutes after the objective has been reached.

Mopping parties must be trained with great care under selected officers. They should always wear a distinguishing mark. They must at once dispose of any occupants who may have emerged from their dugouts, and picket the dugout entrances.

The ultimate unit in the a.s.sault is the platoon. It must be organized and trained as a self-contained unit, capable of producing the required proportion of riflemen, bombers, rifle bombers, Lewis gunners, and carriers, all trained to work in combination.

a.s.saulting troops should have twelve hours of daylight in the trenches before the a.s.sault begins, to enable them to get acquainted with the ground and get some rest. All ranks must be given a hot meal, including hot tea or coffee, before the a.s.sault.

Take every precaution to prevent the enemy from realizing that the a.s.sault is about to take place. Bayonets must not be allowed to show.