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Defeat in detail

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Defeat in detail is a specific military tactic used to overcome a larger opponent. It is also frequently called "divide and conquer." Instead of engaging an entire enemy force at once, an attacker focuses their strength on small, isolated enemy units one after another. This method allows a commander to bring a large portion of their own force to bear against a much smaller segment of the enemy. While this strategy exposes the attacker's own units to many small risks, it can eventually lead to the destruction of an entire enemy force.

To understand this tactic, one must understand how military units function. Most units are strengthened by their proximity to supporting units. Nearby units can provide indirect fire support using artillery or maneuver to launch a counterattack. They can also fire on an attacker's flank to protect their neighbors. Defeat in detail works by exploiting a failure in this coordination. If an attacker can prevent these units from supporting one another, they can use overwhelming force against a single subunit. This minimizes casualties for the attacker and can be repeated until the entire enemy force is eliminated.

There are several ways a defender might become vulnerable to this tactic. One weakness is when units are spread too far apart. If the distance between units is longer than the maximum effective range of their weapons, they cannot provide mutual support. Physical barriers like hills, forests, or rivers can also separate defending units. Additionally, a defender may struggle if their artillery is located too far in the rear. Finally, a lack of effective communication with a command structure can prevent a unit from requesting necessary assistance.

Attackers use specific methods to enable a defeat in detail. They may move faster than the defending units can react to a counterattack. They might also exploit the "OODA loop," which is the speed of an enemy's intelligence, communications, command, and control systems. If an attacker can act faster than the enemy can process information, they gain a massive advantage. Attackers can also use air strikes, artillery, or radio jamming to disrupt the systems required for units to talk to each other. This creates an asymmetric support structure where one unit can help another, but the reverse is not true.

The history of this tactic is long and well-documented. The phrase likely comes from the French term "battre en détail." It was common in French society by 1756 and was quoted by the writer Voltaire in 1758. By 1796, famous military thinkers like Napoleon and Clausewitz were using the term in their own correspondence. This shows that the concept of isolating enemy forces has been a core part of strategic thought for centuries.

Many famous historical campaigns demonstrate the power of this method. In 1796, Napoleon's Montenotte campaign saw his 37,600 men defeat 67,000 Sardinian and Austrian troops. He achieved this through rapid advances that prevented the two nations from combining their armies. In 1862, Stonewall Jackson used this in the Shenandoah Valley. He led 17,000 men against three Union commands totaling 60,000 men by fighting each column one at a time. In 1941, during Operation Compass, the British defeated an Italian force that was more than four times their size. They did this by exploiting the fact that the Italian defenses could not support each other.

Other notable examples include the Battle of Tannenberg in 1914. There, German forces used geography and personal disagreements between Russian commanders to defeat the Russian First and Second Armies. In the Battle of the Teutoburg Forest, a German army under Arminius destroyed three Roman legions. Conversely, the Battle of the Little Bighorn in 1876 serves as a warning. George Armstrong Custer divided his regiment into four portions, which allowed the Sioux and Cheyenne to destroy half of the 7th Cavalry. These examples show how both successful application and poor management of force distribution can decide the outcome of a conflict.

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