The Counterinsurgency Dilemma: Foreign Fighter Influence on Insurgencies in Afghanistan and Somalia

May 8, 2026

Steven Schwartz, former U.S. Ambassador to Somalia with deep African conflict experience, and Tricia Bacon, scholar of foreign fighters and author of The Counterinsurgency Dilemma, discuss when small numbers of outsiders amplify or undermine insurgencies. They explore combat skills and funding outsiders bring, the cultural and legitimacy costs, al-Shabaab’s local evolution, and using foreigner presence as a diagnostic of insurgent strength.

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ANECDOTE

Misreading Foreign Influence Led To Ethiopian Invasion

Early U.S. conflation of East African al-Qaeda operatives with Somalia's Islamic Courts led to support for an Ethiopian invasion.
Tricia Bacon recounts that overthrow enabled extremists to later form al-Shabaab and lead the insurgency.

INSIGHT

Small Foreign Fighter Share Can Still Signal Big Effects

Foreign fighters typically make up at most about 5% of insurgent forces yet correlate with much higher violence and less negotiation.
Tricia Bacon explains this paradox by showing local insurgents (95%) control strategy, resources, and population ties, so they drive outcomes.

INSIGHT

Insurgents Make Calculated Trades For Foreign Fighters

Insurgents weigh clear trade-offs when accepting foreign fighters: combat skills and risk tolerance versus cultural mismatch and civilian alienation.
Bacon notes benefits include training, bomb-making, funding, and aggressiveness that can shift intra-movement power.

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Episode 154 of the Irregular Warfare Podcast examines a core puzzle in intrastate conflict: how a small number of foreign fighters can exert outsized influence on insurgencies. Anchored in Professor Tricia Bacon’s The Counterinsurgency Dilemma, this episode explores when foreign fighters strengthen insurgent groups—and when they undermine them.

While foreign fighters are often associated with higher levels of violence, they typically make up only a small share of insurgent forces. As Bacon argues, this reveals a key insight: local insurgents—not foreign fighters—drive outcomes. They control strategy, resources, and relationships with the population, making them the decisive actors in any insurgency.

Foreign fighters can still provide meaningful advantages. They bring combat experience, specialized skills, and sometimes external funding. Their high risk tolerance and ideological commitment can make groups more aggressive and tactically capable. In fragmented insurgencies, they can even shift the balance of power among rival factions.

However, these benefits come with serious costs. Foreign fighters often lack cultural understanding and local legitimacy, and their preference for extreme violence can alienate civilian populations. Over time, this can strain relationships within insurgent movements, reduce local recruitment, and erode long-term effectiveness.

Drawing on his experience as U.S. Ambassador to Somalia, Steven Schwartz highlights how groups like al-Shabaab evolved from foreign-influenced networks into locally driven organizations. Their durability, he notes, stems less from popular support than from their ability to impose predictable order—often outperforming weak governance alternatives.

Ultimately, the episode reframes foreign fighters as a diagnostic tool rather than the central problem. High levels of foreign fighter influence often signal a weak insurgent group, while limited influence suggests a stronger, locally embedded movement. For practitioners, this distinction matters: effective counterinsurgency must focus on the local dynamics that sustain insurgencies—not just the foreign fighters who draw attention.