The ECOWAS Monitoring Group (ECOMOG) is a multi-national armed force tasked by ECOWAS in 1990 to intervene in the Liberian Civil War. It's role has since expanded to include initiatives for regional security and peace-keeping, with interventions to control conflict in Sierra Leone and Guinea-Bissau.
Nigeria provides the largest component (both of armed forces and financial resources); Ghana, Guinea, Sierra Leone and Gambia also contribute smaller units.
Wikipedia article exploring this regional security initiative, its history, membership, and wider significance.
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