The Economic Community of West African States Monitoring Group (ECOMOG) was a West African multilateral armed force established by the Economic Community of West African States (ECOWAS). ECOMOG was a formal arrangement for separate armies to work together. It was largely supported by personnel and resources of the Nigerian Armed Forces, with sub-battalion strength units contributed by other ECOWAS members — Ghana, Guinea, Sierra Leone, The Gambia, Liberia, Mali, Burkina Faso, Niger, and others.

Sierra Leone, officially the Republic of Sierra Leone, is a country on the southwest coast of West Africa. It shares its southeastern border with Liberia and is bordered by Guinea to the north. With a land area of 71,740 km2 (27,699 sq mi), Sierra Leone has a tropical climate and with a variety of environments ranging from savannas to rainforests. According to the 2015 census, Sierra Leone has a population of 7,092,113, with Freetown serving as both the capital and largest city. The country is divided into five administrative regions, which are further subdivided into 16 districts.