A “weapons system” seeks to attack the enemy preferably in a certain way, taking advantage of its lethal or neutralizing potential. Against it, an enemy will always find an increasingly effective defense: armor, fire, obstacles, mobility; dispersion, concealment with or without cover, etc.
Combined weapons systems seek to produce a synergy, a multiplication of the individual capabilities of the weapons, a compensation for weaknesses or drawbacks and a weakening of enemy capabilities, together with a greater exposure or accentuation of its tactical vulnerabilities.
This synergy should produce effects on enemy combat capabilities and on its speed of action or capacity for movement: It must neutralize enemy defense. It must create in the enemy a vulnerable overexposure, when receiving the effective, complementary and coordinated action of the inter-arms systems. It must produce an operational indecision in the enemy, which harms its speed and capacity to react.
The inter-arms system is a technological and tactical way of increasing the favorable active interfaces on the enemy. It is an element of the operational strategy, carried out on the interesting points of the enemy deployment, to create a tactical vulnerability and to be able to produce the decision or the exploitation with the minimum wear of the available combat capacity of its own.
In the supplementary systems, the enemy defends itself in the same way from all the attacking elementary systems. A kind of saturation or maximum effect of the form of attack undertaken is sought. An example is the indirect fire of artillery and mortars.
In the complementary systems, one of the systems attacks the enemy and when the latter reacts defensively, seeking to dislocate the attacker, it becomes especially vulnerable to the action of the other or several of the other weapon systems used. The enemy thus suffers an extension of his vulnerability, over a longer time or space of action, achieving the three desired effects.
A complementary system is that formed by the obstacle and the fire. To overcome the obstacle, the enemy must concentrate and/or stop his advance and this reduces his impetus or quantity of movement and makes him especially vulnerable to repulse fire, which must not destroy the obstacle. Another complementary system is the fire and tactical maneuver developed by the small units or advance spears of an attack.
Another complementary combined arms system would be the convergent maneuver, taking advantage of positions and terrain and the available combat capacity, echelon it laterally to create more favorable interfaces. Faced with each convergent attack sector, the enemy has to react in a different way. With this, he creates vulnerabilities not well estimated by the enemy, in favor of the rest of the sectors that intervene. On the other hand, the combat capacity deployed towards a rejection will not always be in the best orientation to employ it in another more or less expected direction. If this is combined with neutralizing support fire, the entire enemy system is severely disrupted and dispersed, in its defense plan, in its fire plan and in its conduct.
The inter-arms system seeks to paralyze the enemy’s action or severely disrupt it, by affecting the quality of the combat capacity, generating in it a contradictory and more ineffective mode of action. It also acts in the same way in the successive cycles of action, divided into observation, situation, decision and action. And it does so through the direct deprivation suffered by the enemy of acting coherently and consistently in them, due to the incapacitation of its available combat capacity.
The analysis of the search for the decision in World War I will give us a practical example of the application of the search for the appropriate action interfaces, using inter-arms systems that are different in their composition, although with identical effects and results. Since the tactical solutions achieved on both sides lacked the complement of the sufficient operational movement capacity (the other of the operating systems with which it forms a complementary interactive pair), the operational strategic solution could not be achieved.
The origin of the German assault forces (Stormtroopers) , at the end of 1916, was in the awareness of the need and the possibility of fragmenting the pseudo-compact enemy front, into smaller sectors of advance, practically into advance spears, in which to act through an inter-arms or combined arms system. Favorable action interfaces would thus be created, in which to be able to act with freedom of action, at the level of reinforced assault platoons, which would advance by covered jumps to the enemy positions, behind a relatively short barrage of fire.
Supports in tactical subordination would include Russians shortened 76.2 mm guns, who were very well suited for heavy direct fire support and who lacked the backlash of other cut-off pieces, heavy grenade launchers, light mortars, machine guns and flamethrower squads and engineer platoons (pioneers). These last three supports would be those that would accompany the infantry to the direct assault of the trenches or enemy defense strong points. These were thus isolated from the support of their artillery or other nearby positions, which were neutralized by the German heavy artillery or by other assault sections.
On the other hand, on the Allied side, it was the English who used the first tanks (tanks was their code name in their development), heavy and clumsy, at the level this time of the great front of wide sectors, to provide continuous direct fire support to their infantry and enable them to successfully fight deep into the German tactical zone and even break through it. They were also used to clear trenches along their lines, protected by their armor and using mainly their machine guns.
However, neither side had a single “medium” that could maintain, depending on the use and circumstances, an adequate tactical speed and operational speed without interruption between them. In short, it could successively achieve tactical and operational objectives. The logistic support system was also not developed enough to be able to quickly send a significant flow of supplies and people along narrow, unconsolidated lines of advance.
In effect, there was a tactical speed (very few km per hour) that could be maintained both by infantry (of course, also German) and by tanks designed to support it, and a higher operational speed, maintained by the railway and trucks and other vehicles in the deep operational zone of each belligerent side.
This meant that, once a local tactical breakthrough was achieved, exploitation within the enemy operational zone could not be achieved. Faced with this, any of the contenders would bring their operational or strategic reserves closer in time and convert them into units deployed with full combat readiness. Thus, they created a new tactical zone very close to the breakthrough, blocking it.
To achieve the operational decision, a “means” was needed that was capable of acting with a certain autonomy at both levels of war activity: the tactical or immediate and the operational or deep and transcendent.
In modern warfare, with a considerable deployment of close and long-range, direct and indirect firepower, despite the progressive emptiness of the immediate battlefield (almost thirteen times greater in this world war than a century earlier, in Napoleon’s campaigns), this «means» could only be a well-armed vehicle, sufficiently protected and powered by an internal combustion engine.
But acting according to the tactics of relatively narrow sectors and combined arms systems, developed by the Germans for their assault forces and subsequently used by all their infantry in the general campaign of the spring of 1918, from March 21 to July 18, the date on which the Allies began their general offensive. And counting on reasonable logistics, which would compensate for wear and tear, maintenance and the capacity for operational movement.
In 1917 and 1918, neither of the two sides, neither the Cordial Entente or the Allies nor the European Central Empires, possessed either the two concepts or the specific elements of their application. In fact, a polished and developed synthesis (integrating the nascent war aviation into the German infantry inter-arms system) of the ideas and means of both would be necessary.
However, the Western Allies had the classic means in relative abundance. And they used them according to the knowledge of the time to achieve a strategic decision in the Western European theater. Generalissimo Foch used a strategy of hammering, of stubborn reiteration of efforts. Seeking that the «tactical reaction» provoked in the Germans would affect the strategic capacity of systematic renewal of their defensive front. And, in the end, this German strategic combat capacity collapsed.
And thus the Allies achieved the strategic decision of the war.
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