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Rebel groups that confront the government frequently become engaged in fierce and violent struggles with other groups. Why does a rebel group who is already fighting with the government become engaged in yet another struggle, thereby sacrificing scarce resources in the fight against other rebel groups? This article addresses this puzzle by providing the first global study on the determinants of interrebel violence. The authors argue that this violence should be understood as a means to secure material resources and political leverage that can help the group prevail in the conflict with the government. The quantitative analysis builds on new data on armed conflict between nonstate actors, 1989-2007. The results show that interrebel conflict is more likely when the rebel group fights in an area with drug cultivation, when the group is in control of territory beyond government reach, when the group is either militarily strong or weak in relation to other rebels, and where state authority is weak.

In this article we propose a new typology for insurgent groups to explain why in such remarkably similar conflicts—Sri Lanka and Aceh—the impact of the 2004 Indian Ocean Tsunami was so different. We argue that two principal factors shape all rebel groups by defining their incentive structures: the efficiency of the return on investment of the primary source(s) of support and the group's territorial objectives. The former factor is especially strong in explaining the different choices made by the LTTE and GAM. In Sri Lanka, the availability of lucrative resources outside the country has made the LTTE leadership inimical to compromise, threatened by relief aid, and less reliant on the local population. Lacking access to such high-return funding sources, GAM on the other hand was more closely linked to the needs of the local population and found greater value in both outside aid and a comprehensive settlement.

Rebel groups that confront the government frequently become engaged in fierce and violent struggles with other groups. Why does a rebel group who is already fighting with the government become engaged in yet another struggle, thereby sacrificing scarce resources in the fight against other rebel groups? This article addresses this puzzle by providing the first global study on the determinants of interrebel violence. The authors argue that this violence should be understood as a means to secure material resources and political leverage that can help the group prevail in the conflict with the government. The quantitative analysis builds on new data on armed conflict between nonstate actors, 1989–2007. The results show that interrebel conflict is more likely when the rebel group fights in an area with drug cultivation, when the group is in control of territory beyond government reach, when the group is either militarily strong or weak in relation to other rebels, and where state authority is weak.