Defeat in detail

Defeat in detail, or divide and conquer, is a military tactic of bringing a large portion of one's own force to bear on small enemy units in sequence, rather than engaging the bulk of the enemy force all at once. This exposes one's own units to many small risks but allows for the eventual destruction of an entire enemy force.^[1]

Use

In military strategy and tactics, a recurring theme is that units are strengthened by proximity to supporting units. Nearby units can fire on an attacker's flank, lend indirect fire support such as artillery or maneuver to counterattack. Defeat in detail is the tactic of exploiting failures of an enemy force to co-ordinate and support the various smaller units that make up the force. An overwhelming attack on one defending subunit minimizes casualties on the attacking side and can be repeated a number of times against the defending subunits until all are eliminated.

An attacker can successfully counter defeat in detail by exploiting the absolute weaknesses or the comparative disadvantages in the deployment or structure of defending troops, or advantages, such as maneuvering speed, that the defender cannot match. In a asymmetric support structure, A can support B but unit B cannot support unit A. For example, during World War I, when horse cavalry were still in use to some extent, aircraft could support cavalry, but cavalry had little or no ability to support aircraft. Thus, if a unit is equally suited for use against cavalry and against aircraft, using it to eliminate enemy aircraft would have benefits that would last well into future engagements against enemy cavalry units weaker for their lack of support, but using it against enemy cavalry, leaving the enemy aircraft intact for subsequent engagements, would bring benefits during that engagement alone.

Weaknesses of defenders

Dug-in units that are spread out over so wide a distance that the maximum effective range of their weapons is significantly smaller than the distance between units, which prevents those units from supporting the flanks of neighboring units.
Defending units on opposite sides of physical barriers such as hills, forests or rivers (but see the "reverse slope defence", now rendered obsolete by manned and unmanned aircraft, for a historically-attested deliberate tactic).
Defending units whose artillery support is too far to the rear and so cannot effectively engage attackers.
Defending units that have no effective communications with their command structure and so cannot request assistance.

Enabling methods

The following methods can enable the attacker to defeat the enemy in detail:

Attacking one unit faster than other defending units can move to counter-attack.
Attacking faster than the defending intelligence, communications, command or control systems can respond to (exploiting the OODA loop).
Disabling or disrupting systems required for one defending unit to support another (as by attacking communications, command, or control systems with air strikes, artillery attacks, or radio jamming).

Examples

Strategic campaigns

1796–1797: Napoleon Bonaparte's first campaign in Italy during the French Revolution, in which the French army of 37,000 men defeated 52,000 Piedmontese and Habsburg troops by rapid advances, which prevented the two nations' armies from combining.^[2]
10–15 February 1814: the Six Days' Campaign was a final series of victories by the forces of Napoleon, as the Sixth Coalition armies closed in on Paris.^[3]
1862: Stonewall Jackson's Shenandoah Valley campaign, in which Jackson defeated three Union commands (a total of 60,000 men) with his own command (of 17,000 men), by fighting each of the enemy columns in turn while the Union commands were separated from each other by impassable terrain or a significant distance.
1912–1913: The Balkan League's victory over the Ottoman Empire in the First Balkan War.
1914: The Battle of Tannenberg and the First Battle of the Masurian Lakes, with the Germans exploiting the geography of the Masurian Lakes and the personal antipathy between the Russian commanders to defeat the Russian Second Army and later the Russian First Army.
1941: Operation Compass, when the British defeated an Italian force more than four times larger in North Africa by exploiting the fact that the Italian defenses could not support each other.

Tactical examples

The Battle of Gaugamela, in which Alexander the Great used his Companion Cavalry to charge Darius III
Gallic tribes tried and nearly succeeded in defeating Julius Caesar's army in detail at the Battle of the Sabis.
In the Battle of Teutoburg Forest an army of German tribes under Arminius exterminated Legio XVII, Legio XVIII and Legio XIX, Roman legions under Publius Quinctilius Varus
The Battle of Pavia (1525), during the Italian War of 1521-1526
The Battle of Pratapgarh in which Shivaji defeated the army of Afzal Khan
The Battle of the Nile (1798), when Horatio Lord Nelson brought his ships alongside both sides of anchored French ships in a line and then moved on to the next
The Battle of Raate Road, in Finland (1940)

References

↑ Erickson, Edward J (2003). Defeat in Detail: The Ottoman Army in the Balkans, 1912–1913. Praeger Publishers. ISBN 0-275-97888-5.
↑ Green, Jeremy (April 1997). "General Napoleon Bonaparte's Italian Campaign". Military History.
↑ Webb, Jonathan (2009). "Six Days' Campaign, 1814". theartofbattle.com. ; and Shosenberg, James W. (30 April 2014). "Napoléon's Six Days". Historynet.com.

Bay, Austin (December 31, 2002). "Can the U.S. Handle both Korea and Iraq?". StrategyPage.

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[1] Erickson, Edward J (2003). Defeat in Detail: The Ottoman Army in the Balkans, 1912–1913. Praeger Publishers. ISBN 0-275-97888-5.

[2] Green, Jeremy (April 1997). "General Napoleon Bonaparte's Italian Campaign". Military History.

[3] Webb, Jonathan (2009). "Six Days' Campaign, 1814". theartofbattle.com. ; and Shosenberg, James W. (30 April 2014). "Napoléon's Six Days". Historynet.com.