Every defender who has watched a flood of traffic slam into a single edge router has met the same problem Napoleon spent a career solving from the other direction. When force arrives all at once against one point, that point breaks. The question, for the attacker and the defender alike, is whether the contest is decided at one place or at many. Distributed denial of service is a numbers game, and numbers respond to geometry. The right shape of your defence can turn an overwhelming volume into a series of manageable fractions.
Military foundation
Defeat in detail is the practice of concentrating superior force against isolated parts of an enemy in sequence, rather than meeting the whole enemy at once. Napoleon built much of his reputation on it. By moving faster than his opponents could coordinate, he repeatedly placed the bulk of his army against one fragment of a larger coalition, beat it, and turned to the next before the others could combine. The arithmetic is brutal in its simplicity. A force that would be outmatched against the full enemy can win every engagement if it never has to face the full enemy at once.
The principle cuts both ways. A commander who lets a strong opponent strike a single isolated unit hands over the same advantage. The lesson defenders should draw is the inverse of Napoleon's offence: never present one point where the entire weight of an attack can land, and never let any single element of your line stand alone against the mass. Distribution is not a retreat. It is the deliberate refusal to be concentrated where the enemy wants you concentrated.
Cyber application
A volumetric DDoS attack is concentration of force in its rawest form. The attacker marshals a botnet and aims its combined throughput at one target, betting that the sum of many small streams will exceed the capacity of a single interface, link, or server. If all that traffic converges on one address handled by one machine in one location, the attacker has set up exactly the engagement they want: their whole force against your one point.
Anycast routing inverts that geometry. Instead of one address answered from one place, the same destination address is announced from many locations at once. Networks along the path deliver each request to the nearest announcing site, so inbound traffic is split, by the routing fabric itself, across multiple isolated scrubbing centres spread around the world. The botnet still sends the same total volume, but that volume no longer arrives at a single interface. It is fractured across many, and each centre only ever has to absorb and filter the share that the global routing happened to steer toward it.
This is defeat in detail read backwards and used in your favour. The attacker hoped to concentrate; the architecture forced their force into fragments, and you meet each fragment with a facility built to handle it. Clean traffic is forwarded on to the application, while the flood is filtered close to its point of entry rather than deep inside your network. Because the scrubbing sites are isolated from one another, pressure on one does not propagate to the rest, and capacity can be added by announcing the address from still more locations. The decisive fact is that the combined volume never has a single interface to overwhelm, because no single interface ever sees the whole.
What you practise
In the range, this stops being a diagram and becomes a build. You design resilient, distributed clusters that absorb high-volume traffic and stay standing when one node is saturated. You learn where concentration sneaks back in: a shared upstream link, a single origin behind all your edges, a health check that fails open under load, a stateful component that quietly becomes the one point the whole attack can find. You practise announcing capacity, watching how traffic redistributes, and confirming that a site taken to its limit degrades alone rather than dragging its neighbours down with it.
The habit you are building is geometric thinking under pressure. Before the flood begins, you ask where your defence is concentrated and whether an attacker can force the entire weight of an attack onto it. Then you spread that point until there is no longer a single fraction worth isolating. The opponent brings overwhelming force; you make sure it can never overwhelm anything in particular. Against a contest decided by where the force lands, the defender who controls the shape of the battlefield wins before the first packet arrives.