Read Ebook: Machine-Gun Tactics by Applin R V K Reginald Vincent Kempenfeldt

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Ebook has 516 lines and 69723 words, and 11 pages

Screening guns.

Making artificial cover.

Mutual support .

Indirect fire.

A battery working on a wide front in mutual support.

The writer is fully aware of the condition under which machine guns are officered and manned at present, and that a great error has been made in estimating the time required to train the detachments. The Germans, who have studied the question of machine guns with a thoroughness far greater than that of any other nation, have made them a separate arm of their service, under trained and permanent gunners, and they evidently consider that only specialists can attain the necessary efficiency.

However this may be, it is certain that the officer, whether commanding a section or the batteries of a Division, must be a specialist and a highly trained one.

"I have spent three years in studying machine guns, and consider myself proficient in their use, but I have always been convinced that the requisite skill and knowledge cannot be acquired in a shorter time."

The commanding officer who at present looks upon his machine guns in much the same light as he regards any other portion of his first-line transport--a necessary encumbrance taking away an officer and several men from their proper duties, and a source of anxiety when the regiment goes into action--would regard them with very different feelings if assured of their efficiency and relieved of the responsibility for their tactics and safety. That this is possible without altering the present organisation has been shown; that it is absolutely essential for their efficient use in war it is hoped to demonstrate in the chapters that follow.

GENERAL PRINCIPLES

"Each arm has its special characteristics and functions, and is dependent on the assistance of others; the full power of an army can be exerted only when all its parts act in close combination, and this is not possible unless the members of each arm understand the characteristics of the other arms."

The machine gun cannot yet be regarded as a separate "arm" in our service, nevertheless it possesses a power peculiar to itself; and until this power is studied and thoroughly understood, the principles that should govern its employment in the field cannot be grasped, and consequently its effective use is dependent on chance or accident, and for every success scored a dozen failures will occur, any one of which may be fatal. The preceding chapter has dealt with the peculiarities and power of the machine gun, and it will be seen that it possesses the fire effect of the infantry arm while it has several of the characteristics peculiar to artillery; for instance, it is fired from a mounting by one man, and is moved from position to position by draught or pack animals.

We have seen that the chief characteristic of the machine gun is its power of delivering the "maximum fire from the minimum front"; this fire is of great volume and is highly concentrated, while it can also be made to sweep a wide lateral surface of ground. The gun's narrow frontage in action renders it easy to conceal, and when discovered it presents a very small and difficult target to the enemy's riflemen; on the other hand, when once discovered if it cannot be moved unseen to another position it is liable to suffer a prolonged and concentrated fire from the widely scattered riflemen of the enemy, to which it cannot effectively reply, and which must in time cause loss. Again, its range being limited, it is powerless against artillery except under special circumstances at effective rifle range.

The general principles governing its tactical employment depend upon three factors, viz. the target, the range, the position.

The volume and concentration of its fire necessitate a large and vulnerable target, or ammunition will be expended without adequate results. The first essential is therefore to obtain this description of target and to avoid firing on others which may present themselves.

FIRE EFFECT

We have already seen that the range of the machine gun is practically the same as that of the infantry rifle, but that the beaten zone is only half the depth and about half the width of the collective fire of infantry, partly owing to the rigidity of the mounting, and partly to the fact that the human error is greatly reduced by being concentrated in the person of a single individual, instead of being spread over some 50 men of varying temperament, nerves, and aiming powers.

In addition to these factors, the fire from machine guns is always "collective" and "concentrated" unless deliberately dispersed by the firer, while infantry fire is always "individual" and "dispersed" unless controlled by fire discipline under a leader. Fire discipline and fire control are in the hands of one man--there is no need to point out the target to a scattered firing line, and there is no delay in passing orders down the line, or in the setting of 50 different sights for the correct elevation. Thus fire can be opened far more rapidly and accurately than with rifles, and can be at once directed on a fresh target without ceasing fire, while the effect can be seen by the firer, who can instantly change the rate or cease fire altogether.

RANGES

It will be seen that the 75 per cent., or effective zone, is deepest at 500 yards, and gradually decreases as the range increases up to 2,000 yards; beyond this distance it increases again in about the same ratio up to 3,000 yards.

For ranges over 500 yards it is absolutely necessary to know the range accurately or to find some other method of bringing the "effective zone" on to the target.

The machine gunner may be likened to the fireman with his hose-pipe, whose object is to bring the base of his jet of water to play on a certain spot some distance away from the nozzle of his pipe. He does not trouble about the distance, he does not require to know the range; but pointing the nozzle in the direction of the spot he desires to strike, he elevates or depresses it until he observes the base of the cone of water falling on the right spot, and then he holds his pipe so that it continues to fall where he desires; he does not trouble about the smaller streams and drops of water that fall short or go beyond, but devotes his whole attention to keeping the nucleus of the stream--the 75 per cent. or 50 per cent. zone--falling on his "target." In precisely the same way the machine gunner must look upon his stream of bullets as a stream of water from a hose-pipe, and his object must be to cause the centre of that stream to play on the target, or, in other words, to bring the effective cone of fire on the target so that it is the centre of the beaten zone. This can be done by "observing" the strike of the nucleus of the shots and altering the elevation accordingly. On favourable ground fire can be observed by No. 1 up to 800 yards, but No. 2 with the aid of good glasses can observe fire on favourable ground up to 1,500. This observation of fire is the best method of obtaining the correct elevation at "effective" ranges , if the ground is suitable. The procedure should be as follows: The range should be "estimated" by No. 1, who should then adjust his sight for 100 or 200 yards less elevation than the supposed distance, and fire "groups" of 8 or 10 shots; No. 2 observing the strike of the bullets and saying "short" or "over," as the case may be, while No. 1 alters the elevation between each group until No. 2 says "on," when fire may be continued, still observed by No. 2, until the desired effect has been attained. No. 1 must be careful to fire his first group of shots short of the target, as they are much easier to locate than shots which fall "over."

If the target is only visible for a short time, the groups may be "rapid," but as a rule "deliberate" fire at the quickest rate should be used, and "rapid" only used when the range has been found. If the ground is not favourable for the observation of fire, or the range is too great, this method cannot be used, and it will be necessary to obtain the range by instruments; but it will not always be possible to do so, and it is necessary to find some other reliable way of ensuring that the target is within the "effective" zone.

There are two ways of using combined sights:

The "single gun" method.

The "battery" method.

In , with an estimated range of 1,400 yards, the sights will be set for 1,300 and aim taken; then the sights will be again set for 1,500 yards, but without altering the original aim, and then "rapid" fire opened and the elevating wheel slowly turned to elevate the gun until the 1,500 yards sighting is aligned on the target. The result of this operation is to sweep the whole ground from 1,270 to 1,530 yards with effective fire; and if an error of 125 yards over or under the correct range has been made, the target is nevertheless brought within the effective zone by the combined elevations used. This is the best method for sections or single guns, and a section can vary this by one gun using 1,250 yards elevation and working up to 1,400, while the other gun begins at 1,350 and works up to 1,550. The choice of the amount over and under the estimated range must depend upon the ability of the person estimating the range and circumstances of the case, but less than 100 yards over or under should never be used.

The second method is only used where at least four guns are available, and requires six guns to obtain the best results. The range is estimated as before, and then each gun uses an elevation differing by 25 yards from the next: thus, taking 1,400 yards again as an example of the estimated distance, No. 1 gun will use 1,300; No. 2, 1,325; No. 3, 1,350, and so on, No. 6 using 1,425 yards.

In this way the effective zone of No. 1 gun, which is 60 yards in depth, will just overlap the effective zone of No. 2 gun, and so on right up to No. 6 gun. Thus instead of one small zone of 60 yards of effective fire, we have six guns joining to make one big effective zone 185 yards deep.

Care must be taken not to use more than 25 yards between sights at ranges over 1,400 yards, otherwise there will be gaps between each effective zone, and the fire would be ineffective should the target happen to be at a spot between any two zones.

The methods of firing the gun are laid down in the official Handbook, but it may be added that in using "deliberate" fire the double button should be pressed irregularly so as to imitate rifle fire, and with a little practice a rate of 120 shots a minute can easily be attained.

This kind of fire, although it should seldom be used, will occasionally be serviceable in ranging for observation when it is desired to do away with the peculiar sound of the machine gun and thus not disclose its presence prematurely. In covering a retirement it may also be found useful to deceive the enemy into believing they are only opposed by riflemen, while reserving its full fire power until a good target presents itself at close range.

TAKING UP A POSITION

Except under special circumstances, such as for covering fire or a demonstration, the battery will not move as such into position, but each section will be given its approximate place and move there independently, keeping touch, however, by signal or connecting files with the battery commander and acting in close co-operation with the other sections.

Positions are of two kinds, viz. positions of observation, positions of readiness.

The position of observation will usually precede the position of readiness, and the principal points are the concealment of the guns and detachments, the facilities for observing the enemy and for movement in any direction.

The position of readiness will be in the immediate vicinity of the fire positions, and the guns may be actually in position awaiting the target.

When moving alone on the march, scouts working in pairs must be pushed well out ahead and on the exposed flank or flanks, and they should be trained to use a system of signals to indicate the following: "All clear"; "Enemy in sight"; "A good target in sight"; "Cavalry" ; "Artillery within range"; "A good gun position."

Six simple and unmistakable signals can easily be arranged and learned during peace training, which might prove invaluable in war, for "opportunity" is everything to the machine gunner, and is usually so fleeting as to demand instant action in order to obtain success. On moving to occupy a position as a battery, the guns will usually be in line at from 10 to 100 yards interval, with the section commanders leading their sections and the scouts well ahead; the flank guns must arrange for the protection of the flanks by scouts in the same manner.

The Germans consider that ground scouts should never go into the proposed position, as they are likely to expose themselves to the enemy, and thus "give the position away," and, as already pointed out, "surprise" is the essence of success. They say that the commander of the battery or section, whichever the unit may be, should alone examine the position and select the place for his battery or section to come into action--and this is the right method as a general principle; but in broken or hilly country, where cover is abundant, and where the position is extensive, a battery commander can do no more than indicate generally the positions to be occupied by the sections, and it will then be advisable for the section commanders to personally select the positions for their guns. If the cover is good, the range-finders may next occupy the gun positions and proceed to take ranges. They must be most careful not to show themselves in the least and should work from cover to cover, some distance from the gun positions and not on the same alignment. The ranges must be noted on proper range cards, and when complete sent to the section commanders. In open country, where there is no good cover in the position, the scouts will only approach it sufficiently to ensure that it is not occupied by the enemy, and will then halt and find a good position for the guns to be dismounted; the commander, passing through the scouts, will then reconnoitre the position himself, and select the place for coming into action. There are two methods of taking up a position, which depend for their choice upon the proximity of the enemy and the time at which fire is to be opened. The first is the "deliberate" method, when the guns are brought up and the range taken before the target appears. In this case cover is essential to success, and the guns must be most carefully concealed, the whole object being to surprise the enemy when the moment arrives, and thus concealment is of the first importance. The second method is used when the enemy is in the immediate vicinity, when the country is open and the position without cover, or when the position is within artillery range of the enemy. The guns unlimber and prepare for action immediately in rear of the gun positions, and as close to them as possible and completely out of sight of the enemy. The commander alone goes into the position, and having selected approximately where each gun is to go, he stations them immediately in rear of their intended places out of sight and then creeps into the position himself and watches for the opportune moment; when this arrives, a blast on his whistle brings the guns up with a rush, no concealment is attempted, but, fully exposed, each gun opens fire on the nearest target. If the moment has been rightly judged and the range properly estimated, 60 to 90 seconds is sufficient time to obtain the desired effect, and before the enemy's artillery can get the range a second signal from the commander sends the guns out of action again as rapidly as they appeared. This is one of the most successful methods of employing machine guns: there is no risk of being seen before the target appears, there is no "giving away the position" by careless scouts, and there is no chance that a powerful pair of glasses will discover the guns in position before they open fire and turn the tables by surprising them instead. On the other hand, it requires very highly trained detachments and a vast amount of peace practice to ensure its success in war.

Alternative positions are always necessary when the deliberate method is used, and must be carefully practised in peace--the principal points to be observed being: That the second position is suitable for bringing effective fire to bear on the enemy, and that the gun is able to gain the position without exposure.

Scouts so often forget that they can work with ease where it is impossible to carry a gun; and unless the above conditions are fulfilled, the alternative position will be useless.

COVER

Cover may be of two kinds:

Cover from fire must be proof against the projectiles likely to be used against it--that is, against rifle fire and shrapnel. "Cover from fire" should also be "cover from view" if possible; it must be inconspicuous, and should be of the same colour and material as the background and locality. It must be as low as is compatible with command, and must never be on the skyline. The following points in the order given constitute good "cover from fire":

Bullet proof.

Good field of fire.

Invisibility.

Protection from enfilade fire.

Good line of retreat .

"Cover from view" is often not cover from fire, and must be used with great caution; it is the principal means by which guns are brought up to the fire position without the enemy's knowledge, thus effecting a surprise. Cover may be either natural, artificial, a combination of both.

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