Insurgent Forces

Irregular armed forces that resist an existing government by force and are key actors in civil wars and conflicts

Insurgent Forces

Overview

Insurgent forces (叛軍/反軍, insurgent forces) refer to irregular armed forces that wage armed struggle against an existing government or state power. They conduct organized armed struggle to achieve political, economic, ethnic, or religious objectives, and unlike regular armies, they fall outside the state's lawful control, which distinguishes them from paramilitary organizations or militias. Insurgent forces are key actors in civil wars, and their existence and patterns of activity themselves serve as indicators of the legitimacy of governance and the security situation in the country concerned.

Main Content

Definition and Conceptual Distinction

Insurgent forces are armed organizations with clear political goals, such as seizing state power, achieving separatist independence, or expanding autonomy. Unlike simple criminal organizations or religious groups, the key point is that they challenge the political order by force. They are distinguished from the following concepts.

Regular army: Has a state's lawful command system and budget, and the right to engage in hostilities under international law.
Terrorists: Terrorism may be used as one of an insurgent group's tactics, but "terrorism" is a term defining the nature of acts as organized violence against civilians; in insurgency studies, distinction is made based on political purpose and organizational character.
Militias and vigilante groups: Have a strong local defense purpose and limited political goals.
Paramilitary organizations: Armed organizations operated or sponsored unofficially by a state.

Causes of Emergence

The formation of insurgent forces is explained as the result of a combination of complex factors rather than a single cause. Representative factors include political exclusion and power struggles, ethnic, religious, or linguistic marginalization of minority groups, economic inequality and conflicts over resource distribution, land and water disputes, loss of state control (fragile states and failed states), and intervention and sponsorship by external actors. In academia, approaches that analyze economic interests and political grievances together, such as "relative deprivation theory" and the "greed and grievance" model, are widely used.

Organization and Strategy

Insurgent forces usually adopt guerrilla warfare as their basic tactic to overcome asymmetric capabilities. They range from organizations with centralized command systems to cell-based network organizations, and are divided into "controlling insurgents" and "dispersed insurgents" depending on whether they control territory. Key strategic elements are as follows.

1. Military tactics: ambushes, raids, improvised explosive devices (IEDs), use of unmanned aerial vehicles, cutting supply routes

2. Political activities: operating shadow governments, providing services to civilians, propaganda and recruitment activities

3. Financing: looting and extortion, smuggling and illicit resource trade, taxation, diaspora support, state sponsorship

4. External relations: demanding recognition of legitimacy from the international community, links with foreign governments and non-state actors

Status under International Law

International humanitarian law treats insurgent forces as parties to "non-international armed conflicts." Common Article 3 of the Geneva Conventions and Additional Protocol II impose obligations on non-governmental armed groups that meet certain requirements, which include an organized command structure, the capacity for sustained and concerted military operations, and compliance with humanitarian law. The combatant status and prisoner-of-war treatment of insurgent members, and the protection of civilians, remain contested issues in each conflict.

Major Cases

Colombia's FARC (Revolutionary Armed Forces of Colombia): after the 2016 peace agreement, some remaining forces split
Many insurgent organizations in the Syrian civil war: the direct trigger of the regime change in late 2024
Myanmar's ethnic armed organizations and People's Defense Forces (PDF)
The Taliban in Afghanistan: transitioned from an insurgent force to a governing force after regaining power in 2021
Various armed groups in the Sahel region of Africa (JNIM, ISSP, etc.)

Latest Trends

In 2024–2025, research on insurgent forces and international attention can be summarized in several trends. First, in December 2024, an insurgent coalition including HTS in Syria toppled the Assad regime, reconfirming the case of insurgent forces seizing state power in a short period. Second, as the Myanmar civil war and conflicts in the Sahel region become protracted, the stalemate between military regimes and insurgent forces is deepening the international humanitarian crisis. Third, as commercial drones, satellite internet, and social media are widely used by insurgent forces for reconnaissance, strikes, recruitment, and propaganda, the patterns of asymmetric warfare are changing rapidly. Fourth, with the spread of tactics from the Ukraine war and the problem of weapons smuggling networks, the boundary between insurgent forces and state-sponsored actors is blurring. Fifth, in Colombia and elsewhere, delays in implementing peace agreements and the re-fragmentation of remaining insurgent forces have emerged, making the "post-peace insurgency" issue a new research topic.