The Congo constituted the largest peace-keeping operation in the history of the United Nations, at least until recently, being only exceeded in scale by current actions in Yugoslavia, Cambodia, and Somalia. It included, during 1960–4, not only civilian advisers who helped run the central règime in Lèopoldiville, but also an army which, at full strength, comprised 19,000 troops. They intervened extensively in the politics of the country, thereby not conforming to the popular image of a passive ‘peace-keeping’ force.