Royal Army College

Lesson Overview

Lesson 02 established what the principles of war are: distilled guidance applied with judgement, not fixed rules. This lesson and the next examine the Commonwealth tradition's principles one by one. This first lesson takes four that belong closely together: the selection and maintenance of the aim, which is the master principle; the concentration of force; the economy of effort; and flexibility.

These four form a connected group about focusing and directing effort. The aim sets what the effort is for. Concentration and economy decide where it goes. Flexibility adjusts that direction as the situation changes. Taught together, they show how the principles work as a whole rather than a list.

The principles are taught here not as a recipe for battle but as a framework for thinking clearly about any operation, including the floods, fires, and searches this Army conducts. Concentration of force, for instance, applies to massing relief at the point of greatest need just as it applies to massing combat power at a decisive point. Each principle remains a consideration to weigh against the others, and the four in this group pull against one another in ways the officer must learn to balance.

By the end you will be able to explain the selection and maintenance of the aim and why it is the master principle; explain concentration of force and why the decisive point matters; explain economy of effort and its relationship to concentration; explain flexibility and why the ability to adjust is essential under uncertainty; and apply all four to the operations of a small humanitarian home-defence force, balancing them with judgement.

Key Terms

Selection and maintenance of the aim: the master principle; an operation must have a single clear aim, rightly chosen at the outset and held to throughout, to which all effort is directed and the other principles subordinate.
The aim: the single clear purpose of an operation, which gives it direction and the standard against which every decision is judged.
Concentration of force: bringing decisive strength to bear at the decisive point rather than spreading it thinly everywhere.
The decisive point: the place, time, or activity where an operation is won or lost; the same idea as the main effort of the command course.
Economy of effort: allocating no more than necessary to secondary tasks so that strength can be concentrated where it is decisive; the partner of concentration.
Flexibility: retaining the ability to adjust as the situation changes, in plans, dispositions, and mind.
The connected group: the aim, concentration, economy, and flexibility working together, the aim setting direction, concentration and economy directing effort, flexibility adjusting it.

Selection and maintenance of the aim

This is the master principle, the first and most important, and it governs the application of all the others. It has two parts. The selection is getting the aim right at the outset. The maintenance is holding to it as the operation unfolds.

Selection means choosing a single clear purpose: what the operation is to achieve. The estimate of the command course taught that the first and most important step is to establish the real aim, and the principle of the aim raises that truth to a principle of war. The aim gives the operation its direction and the standard against which every decision is judged. An operation with no clear aim, or with several competing ones, or with a vague or wrong one, cannot be conducted soundly: the effort scatters, the decisions have no measure, and the operation drifts. Getting the real aim right, clearly stated, is therefore the foundation of everything that follows.

Maintenance is the discipline of holding to the aim throughout, and it matters as much as selection, because an aim well chosen but then lost is no better than no aim at all. The danger is drift: being drawn off by opportunities or difficulties, slipping into secondary matters, gradually losing sight of the original purpose. Maintenance guards against that.

This is not rigidity. An operation must adapt its methods as the situation changes, which is flexibility, the fourth principle of this lesson. But it adapts the means in service of the same aim rather than abandoning the aim itself. Holding to the aim while adapting the means is the art, and the lesson returns to it.

The aim is the master principle because all the others serve it. Concentration concentrates on the aim; economy economises in its service; flexibility adapts the means to it. An operation that gets the aim right has the foundation for applying the rest. One that gets it wrong, or loses it, has no sound foundation for anything.

Concentration of force and economy of effort

These two belong together as a pair, two sides of one idea about where effort is put, and the officer should understand them together.

Concentration of force says an operation should mass its effort where it will be decisive rather than spread it thinly and evenly. Experience shows, again and again, that decisive results come from concentrating strength at the decisive point, the place, time, or activity where the operation will be won or lost. Dispersing effort uniformly produces weakness everywhere and decisiveness nowhere. This is the main effort of the command course: identify the decisive point, mass effort there, and accept less elsewhere. The principle prompts a constant question: where is the decisive point, and am I concentrating there? The temptation is always to spread effort to cover everything, which feels prudent but yields uniform weakness. In a relief operation, concentration means massing the relief effort at the point of greatest or most urgent need rather than thinning it across the whole area.

Economy of effort is the partner that makes concentration possible. Resources are finite. Concentrating at the decisive point means using no more than necessary on secondary tasks, so the strength is freed to mass where it matters. Economy is not doing everything as cheaply as possible; it is allocating rightly: enough at the decisive point to be decisive there, and no more than necessary elsewhere. An operation that over-invests in secondary tasks dissipates its strength and cannot concentrate; one that economises rightly keeps the strength to do so.

Together they express one idea: concentrate strength at the decisive point, which requires using no more than necessary elsewhere, so the operation is strong where it matters and economical where it does not, all in service of the aim.

   CONCENTRATION OF FORCE + ECONOMY OF EFFORT (a pair)

   THE AIM (master principle) sets WHAT the effort is for
        |
        v
   CONCENTRATION OF FORCE          ECONOMY OF EFFORT
   mass decisive strength at        use no more than necessary on
   the DECISIVE POINT               SECONDARY tasks
   (where it is won or lost)        |
        ^                           | freeing strength to mass
        |                           | where it is decisive
        |___________________________|

   Spread effort thinly = weak everywhere, decisive nowhere.
   (Relief: mass the effort at the point of greatest need,
   economise elsewhere.)

Flexibility

The fourth principle is flexibility: retaining the ability to adjust as the situation changes. It belongs with the first three because it is about adjusting the direction of effort that the aim sets and concentration and economy direct. The command course taught that uncertainty and friction are the normal climate of operations and that no plan survives contact with reality unchanged. Flexibility is the principle that names the requirement to adapt.

A flexible operation keeps its plans from becoming so rigid they cannot be changed, keeps something in hand and some freedom of action, and keeps the commander's mind ready to adapt the means. An inflexible one is brittle: it commits everything to a fixed plan, keeps no freedom of action, and is overtaken when the situation changes, as it will. The principle prompts the officer to ask whether the plan can bend, whether a reserve has been kept, and whether the mind is ready to adjust.

This applies fully to a home-defence force, whose tasks, floods, fires, searches, are exactly the fast-changing situations that demand adaptation. A relief operation that cannot adjust when the water rises faster than expected, or the fire shifts, is overtaken; a flexible one adapts and keeps serving its aim.

Flexibility has a particular relationship to the maintenance of the aim, and the two might seem to conflict. One says hold to the aim throughout; the other says adapt as the situation changes. They reconcile through the distinction between the aim and the means. Flexibility adapts the means, the methods, plans, and dispositions, in service of the unchanging aim; it does not abandon the aim. The flexible operation changes how it pursues its aim while holding to the aim itself. So flexibility and the maintenance of the aim work together: the aim held, the means adapted. This is the art the command course taught of keeping the plan's purpose while changing its detail. Flexibility thus completes the group: the aim sets direction, concentration and economy direct the effort, and flexibility adjusts the means as the situation requires.

Balancing the four with judgement

The four form a connected whole, and they mostly work together: the aim sets what the effort is for, concentration puts it where it is decisive, economy frees it for concentration, and flexibility adjusts it as the situation changes. The officer applies them together: fix a clear aim and hold to it, concentrate at the decisive point, economise on the secondary, and keep the flexibility to adapt.

But they also pull against one another, and balancing the tensions is judgement, not rule, exactly as Lesson 02 taught. Concentration pulls toward committing strength at the decisive point, which can be in tension with flexibility, since the reserve flexibility keeps is strength not concentrated. The officer must mass enough to be decisive while keeping enough in hand to stay flexible. Economy pulls toward minimal resources on secondary tasks, which can be in tension with the security those tasks provide or with keeping options open. The maintenance of the aim pulls toward holding the course, balanced against flexibility's readiness to adapt; the resolution is to adapt the means while holding the aim.

The four cannot all be maximised at once. The officer's task is to balance them in the particular situation: how much to concentrate against how much to keep flexible, how far to economise against how much margin to keep, how firmly to hold the means against how readily to adapt them. That balancing, weighing the principles in service of the aim rather than satisfying each in isolation, is the art of applying them. The remaining principles, examined in Lesson 04, join this group to complete one integrated framework, headed by the master principle of the aim and balanced throughout by judgement.

In Practice: Focusing the Effort in a Flood

An officer of the Royal Kaharagian Army commands a relief operation in a widespread flood and brings the four principles to bear.

She begins with the master principle. She fixes a single clear aim: the vulnerable people across the flooded area are to be reached and brought to safety before the water cuts them off. She resolves to hold to it, not to be drawn off by the many secondary matters the operation will throw up. The aim gives her operation its direction and the standard for every decision.

Then she applies concentration and economy together. The flood is widespread, and the temptation is to spread the relief effort thinly across the whole area; she resists it, because dispersed effort would be weak everywhere and decisive nowhere. She identifies the decisive point, the lowest ground, where the most vulnerable will be cut off first, and concentrates her strength there. To make that possible, she economises on the secondary areas, allocating no more than necessary to places of lesser or less urgent need, freeing the strength to mass where it counts.

She keeps flexibility throughout, because the flood will not stay as planned. She keeps the plan adaptable, holds a reserve, and keeps her own mind ready. When the water rises faster on one side than expected, she shifts effort to the newly threatened area, adapting the means while holding to the aim of reaching the vulnerable in time. She balances concentration against flexibility, massing enough to be decisive while keeping enough in hand to adapt, and weighs economy against the margin she needs. None of this is mechanical; she weighs the four with judgement in the situation before her. The result is an operation clear in its aim, concentrated where the need is decisive, economical where it is not, and flexible enough to adapt as the flood changes, which is what the principles, applied to the work this Army actually does, are for.

Check Your Understanding

Explain both parts of the selection and maintenance of the aim and why it is the master principle. Why can an operation with a well-selected aim still fail if the aim is not maintained, and how is maintenance reconciled with the need to adapt?
Explain concentration of force and economy of effort and why they are a connected pair. Why does concentrating at the decisive point require economising elsewhere, and how do both apply to a flood relief operation?
Explain flexibility and why uncertainty and friction make it essential, and how it is reconciled with the maintenance of the aim through the distinction between aim and means. Then explain how the four principles both work together and pull against one another.

Reflection (write a short paragraph): This lesson teaches that the most important thing is to fix a single clear aim and hold to it, while still adapting your methods as the situation changes. Think about how that applies beyond military operations, to any goal you pursue. Are you someone who fixes a clear aim and holds to it, or are you easily distracted by the opportunities and difficulties that arise along the way? And are you flexible enough to change your methods when the situation shifts, or do you cling to a fixed plan even when it stops working? Most people err in one direction or the other. Consider the art of holding to the aim while adapting the means, which asks for constancy of purpose and flexibility of method at once, and describe one way you could begin practising that balance now, in pursuit of a goal of your own.

Summary

The selection and maintenance of the aim is the master principle. Selection chooses a single clear aim at the outset, the same truth as the estimate's first step; maintenance holds to it throughout, since an aim well chosen but lost is no better than none. All the others serve it: concentration concentrates on it, economy economises in its service, flexibility adapts the means to it.
Concentration of force and economy of effort are a connected pair. Concentration masses decisive strength at the decisive point rather than spreading effort thinly, which is weak everywhere and decisive nowhere; in relief work it means massing effort at the point of greatest or most urgent need. Economy frees that strength by allocating no more than necessary to secondary tasks, because finite resources must be economised on the secondary to be massed at the decisive point.
Flexibility retains the ability to adjust as the situation changes, in plans, dispositions, and mind, made essential by the uncertainty and friction normal to operations. A flexible operation keeps its plans adaptable, holds a reserve, and keeps the mind ready; an inflexible one is overtaken. It is reconciled with the maintenance of the aim by the distinction between aim and means: the aim held, the means adapted.
The four pull against one another and cannot all be maximised at once: concentration against flexibility's reserve, economy against the security or options secondary effort might give, the maintenance of the aim against flexibility's readiness to adapt. The officer balances them with judgement in the particular situation, applied as Lesson 02 taught: distilled considerations weighed in service of the clear aim, not rules mechanically satisfied. Lesson 04 adds the remaining principles to complete the framework.

The Principles of War (I): the Aim, Concentration, Economy of Effort, Flexibility