The United Nations has been engaged in peacekeeping in the Democratic Republic of the Congo since the period of the country’s independence. First it was the Opération des Nations Unies au Congo (onuc), then the Mission de l’Organisation des Nations Unies au Congo (monuc), and the most recent un peacekeeping force is called Mission de l’Organisation des Nations Unies pour la Stabilisation au Congo (monusco). Most recently, monusco acquired a Force Intervention Brigade (fib). In this contribution, an analysis is made of how the bedrock principles of peacekeeping – impartiality, consent, and a restricted use of force – have evolved in the Congo. To do so, the journey begins in the 1960s, and ends in early 2015. For each principle, we will look at its traditional meaning, as well as its application to onuc, monuc, and monusco with its Force Intervention Brigade.