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Galula and Thompson — The Two Architects of Modern COIN Doctrine

The Theorists the Military Kept Losing

David Galula and Robert Thompson are the two intellectual pillars of modern population-centric counterinsurgency doctrine. Both derived their frameworks from direct field experience in successful (Malaya) and partially successful (Algeria) COIN campaigns. Both produced systematic theoretical texts in the 1960s that were essentially ignored by the US military until Iraq made them urgently relevant. Both were rediscovered under pressure, after the fact, to provide doctrinal foundation for FM 3-24. Both had been saying the same things for forty years.1

David Galula — The 80/20 Formula

Galula was a French army officer who served in Algeria (1956–1958) as a district commander responsible for pacifying a specific rural area. His direct experience produced Counterinsurgency Warfare: Theory and Practice (1964) — the most rigorous theoretical framework for counterinsurgency produced in the 20th century.

Galula's central claim: insurgency is 80 percent political and 20 percent military. This is not a moral argument or a humanitarian preference — it is a strategic claim. The population is the center of gravity; military operations are relevant only insofar as they affect the population's alignment. An operation that kills fifty insurgents but generates civilian casualties that shift the neutral 60 percent toward the insurgency is strategically negative regardless of its tactical success.1

Galula's four phases of COIN:

  1. Destroy or expel the main insurgent forces from the area
  2. Station sufficient forces to provide lasting security
  3. Establish contact with the population, gain its support
  4. Build local government capable of self-sustaining security

The sequence is critical: security first, governance second. The population cannot support the government when it is under physical threat from the insurgency. The strategic sequence is security → intelligence → governance, not governance → security.

The 20 percent / 60 percent / 20 percent model: Galula estimated that in any insurgency-affected area, approximately 20 percent of the population actively supports the insurgent, 20 percent actively supports the government, and 60 percent is neutral — making decisions based on self-interest calculations. The battle is for the 60 percent. Win them to government support (or at least neutrality) and the insurgent's operational base collapses.

Robert Thompson — Rule of Law as Foundation

Thompson served as the senior British advisory figure in Malaya (1948–1960) and later advised the US in Vietnam. His framework, articulated in Defeating Communist Insurgency (1966), emphasizes the legal and administrative framework as the non-negotiable foundation for COIN.

Thompson's five principles:

  1. The government must have a clear political aim
  2. The government must function within the law
  3. The government must have an overall plan for all activities — civil and military
  4. The government must give priority to defeating the political subversion, not the armed insurgents
  5. In the guerrilla phase, the government must secure its base areas first1

The "rule of law" principle is Thompson's most distinctive contribution. A government that uses torture, collective punishment, or extra-judicial killing to fight an insurgency destroys the legal legitimacy that distinguishes it from the insurgent. If the government operates outside the law to fight those who operate outside the law, the population cannot distinguish between them on governance grounds — and governance legitimacy is the variable the government is supposed to be winning.

Thompson's critique of Vietnam (which he witnessed firsthand from 1961–1965) was consistent with this principle: the Strategic Hamlets program was implemented coercively and corruptly, the South Vietnamese government was not building a functioning legal system, and the American emphasis on firepower over governance was addressing the military 20 percent while losing the political 80 percent.

Where Galula and Thompson Agree

Population is decisive: Both Galula and Thompson locate the decisive variable in the population's alignment, not in the enemy's military defeat. Security provision, governance quality, and intelligence generation are all functions of the population relationship.

Intelligence is existential: Neither COIN framework can function without intelligence — and intelligence generation requires population cooperation. The population provides or withholds intelligence based on its protection calculation. Win the protection bet, win the intelligence.

Host-nation capacity is the exit strategy: Both theorists recognize that no external counterinsurgent can stay forever. The COIN operation succeeds only if it builds indigenous security and governance capacity capable of sustaining without external support.

Where They Diverge

Sequencing: Galula prioritizes security before governance; Thompson argues the legal/administrative framework must precede military operations or the military operations will undermine governance. In practice this is a sequencing question: at what point does the security operation hand off to the governance operation?

Legalism: Thompson's rule-of-law emphasis is more absolute than Galula's. Galula acknowledges that in practice COIN operations cannot be conducted entirely within peacetime legal constraints — some coercion is necessary. Thompson argues that every deviation from rule-of-law is a political cost that must be explicitly justified.

Cross-Domain Handshakes

Arthashastra — Kingship (History): Arthashastra — Kingship and the Rajarshi Ideal — Kautilya's rajarshi (king-sage) ideal — governance as applied ethics at scale — parallels Thompson's rule-of-law emphasis. Both frameworks argue that the counterinsurgent's moral authority is a strategic asset, not just an ethical constraint. Kautilya's exhausting daily governance schedule (designed to prevent corruption and demonstrate attentiveness) is the ancient-world equivalent of Thompson's functioning-within-the-law requirement.

Social Force Conformity (Psychology): Social Force Conformity — Galula's 20/60/20 model is a social conformity model: the neutral 60 percent follows the signal environment created by the two active minorities. The government wins not by converting the 20 percent that actively supports the insurgent but by creating a signal environment where neutrality drifts toward government alignment. This is exactly how social conformity operates: the majority follows visible signals about what is safe and normal.

The Live Edge

The Sharpest Implication Both Galula and Thompson were writing in the 1960s, after empirical experience with successful and failed counterinsurgencies. Both produced frameworks that were ignored until Iraq made them urgently relevant — forty years later, after enormous additional costs. The question is not whether the frameworks are correct but why correct frameworks are institutionally invisible until catastrophe forces attention. The answer is structural: military institutions reward conventional warfare expertise and deprioritize irregular warfare theory. Galula and Thompson didn't fail to persuade; they succeeded — and the institution lost the persuasion between 1966 and 2003.

Generative Questions

  • If Galula's 80/20 formula is correct (insurgency is 80 percent political), why do COIN budgets consistently allocate more than 80 percent to military operations? Is this an analytical failure, a bureaucratic incentive problem, or a genuine operational constraint?

Connected Concepts

Footnotes