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Are UN peacekeepers effective in protecting civilians from violence? Existing studies examine this issue at the country level, thereby making it difficult to isolate the effect of peacekeepers and to assess the actual mechanism at work. We provide the first comprehensive evaluation of UN peacekeeping success in protecting civilians at the subnational level. We argue that peacekeepers through their sizable local presence can increase the political and military costs for warring actors to engage in civilian targeting. Since peacekeepers' access to civilian populations rests on government consent, peacekeepers will primarily be effective in imposing these costs on rebel groups, but less so for government actors. To test these conjectures we combine new monthly data on the location of peacekeepers with data on the location and timing of civilian killings in Africa. Our findings suggest that local peacekeeping presence enhances the effectiveness of civilian protection against rebel abuse, but that UN peacekeeping struggles to protect civilians from government forces.

While United Nations peacekeeping missions were created to keep peace and perform post-conflict activities, since the end of the Cold War peacekeepers are more often deployed to active conflicts. Yet, we know little about their ability to manage ongoing violence. This article provides the first broad empirical examination of UN peacekeeping effectiveness in reducing battlefield violence in civil wars. We analyze how the number of UN peacekeeping personnel deployed influences the amount of battlefield deaths in all civil wars in Africa from 1992 to 2011. The analyses show that increasing numbers of armed military troops are associated with reduced battlefield deaths, while police and observers are not. Considering that the UN is often criticized for ineffectiveness, these results have important implications: if appropriately composed, UN peacekeeping missions reduce violent conflict.

Protection of civilians is now at the forefront of the responsibilities of the international community. There is a strong international norm that civilian populations should be protected from violence. But how committed is the United Nations to acting in line with this norm? I argue that the UN Security Council (UNSC) has an interest in demonstrating that it takes violence against civilians seriously. Through a broadened security agenda including human security, the legitimacy and the credibility of the UNSC hinges on its ability to act as a guarantor of civilian protection. As a consequence, the UN is more likely to deploy peace operations in conflicts where the warring parties target the civilian population. The argument is supported by a statistical examination of all internal armed conflicts in 1989-2006. The results show that the likelihood of a UN peace operation is higher in conflicts with high levels of violence against civilians, but this effect is mainly visible after 1999. This year marked a shift in the global security agenda and it was also when the UNSC first issued an explicit mandate to protect civilians. Conflicts with high levels of violence against civilians are also more likely to get operations with robust mandates. This suggests that the UNSC is not just paying lip service to the protection norm, but that it actually acts to implement it.

Does United Nations peacekeeping protect civilians in civil war? Civilian protection is a primary purpose of UN peacekeeping, yet there is little systematic evidence for whether peacekeeping prevents civilian deaths. We propose that UN peacekeeping can protect civilians if missions are adequately composed of military troops and police in large numbers. Using unique monthly data on the number and type of UN personnel contributed to peacekeeping operations, along with monthly data on civilian deaths from 1991 to 2008 in armed conflicts in Africa, we find that as the UN commits more military and police forces to a peacekeeping mission, fewer civilians are targeted with violence. The effect is substantialthe analyses show that, on average, deploying several thousand troops and several hundred police dramatically reduces civilian killings. We conclude that although the UN is often criticized for its failures, UN peacekeeping is an effective mechanism of civilian protection.