The UN Security Council meeting on 18 September 2014 represented a major turning-point in the international response to the Ebola outbreak then underway in West Africa. However, in the light of widespread criticism over the tardiness of the international response, it can be argued that the UN, and particularly the Security Council, failed to make best use of a potential resource it already had on the ground in Liberia: the United Nations Mission in Liberia (UNMIL). This article examines whether UNMIL could have done more to contribute to the emergency response and attempts to draw some lessons from this experience for potential peacekeeper involvement in future public health emergencies.