Successes as well as failures
In recent years, the peacekeeping operation of the UN in Sierra Leone has become an often cited example of successful peacekeeping. From 1999 to 2005, UN peacekeepers worked in Sierra Leone to stabilise the country during and after the civil war. The main objectives of the mission were to assist in the disarmament and enforce the terms of the Lome Peace Agreement. The UN was also involved in setting up a court to try those accused of crimes against humanity, war crimes and violations of both international humanitarian law and domestic laws.
A study by Virginia Page Fortna titled
Does Peacekeeping Work? looked directly at the outcomes of peacekeeping in instances of civil war.
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She finds that while on average peacekeeping missions have a lower success rate (defined as continued peace), this is due to a selection effect. The selection effect exists because the decision to intervene is not random — neither is the onset of conflict. Peacekeeping missions are less successful on average because the UN and other peacekeeping organisations only intervene in the most challenging and difficult conflicts. Controlling for these factors, she finds that the presence of peacekeepers reduces the risk of sliding back into civil war by 80 percent. More information on civil wars can be found on the
Civil War, Our World in Data page.