Counterinsurgency

Counterinsurgency (often abbreviated COIN) refers to the integrated set of activities a state—or a coalition supporting a state—uses to defeat armed groups that seek to overthrow, secede from, or coerce a recognized government. Unlike conventional warfare, which targets uniformed enemy forces, counterinsurgency operates in a contested political environment where the loyalty of the civilian population is the central prize.

Modern COIN doctrine draws on several historical experiences. The French theorist David Galula, writing on the Algerian War, and British practice in the Malayan Emergency (1948–1960) under Sir Gerald Templer popularized the idea that political legitimacy, intelligence, and population security matter more than kinetic operations. These ideas were codified for the United States in the 2006 U.S. Army and Marine Corps field manual FM 3-24, overseen by then–Lieutenant General David Petraeus, and applied during the 2007 "surge" in Iraq and later in Afghanistan.

Typical COIN activities include:

• Population-centric security: protecting civilians from insurgent intimidation, often through dispersed outposts rather than large bases.
• Governance and development: building local administrative capacity, delivering services, and addressing grievances over land, employment, or representation.
• Intelligence-led targeting: separating insurgent fighters from sympathizers and the broader population.
• Host-nation capacity building: training local police, militaries, and judicial institutions to assume responsibility over time.
• Information operations: countering insurgent propaganda and communicating government legitimacy.

Critics argue COIN is resource-intensive, slow, and historically inconclusive. The withdrawals from Iraq (2011) and Afghanistan (2021) prompted renewed debate over whether large-scale population-centric campaigns are sustainable, and many Western militaries have since shifted emphasis back toward "great power competition." Counterinsurgency remains relevant, however, in ongoing conflicts involving groups such as the Taliban, al-Shabaab, Boko Haram, and various ISIS affiliates, and in domestic campaigns by states including Colombia, the Philippines, and India.