Organisation des Nations Unies au Congo, abbreviated ONUC (English: The United Nations Organization in the Congo), was a United Nations peacekeeping force in Congo that was established after United Nations Security Council Resolution 143 of 14 July 1960. From 1963 the name changed to Opération des Nations Unies au Congo, keeping the same abbreviation. To generalise, the mission was a response to the Congo Crisis. ONUC was the UN's first peacekeeping mission with a significant military force, yet ONUC has been described as a "pyrrhic victory at best."