United Nations Observer Mission in Sierra Leone

The United Nations Observer Mission in Sierra Leone (UNOMSIL) was a United Nationspeacekeeping operation in Sierra Leone from 1998 to 1999 that was established with the passage of United Nations Security CouncilResolution 1181. Its mission was to monitor the military and security situation in Sierra Leone. The mission was terminated in October 1999, when the Security Council authorized deployment of a new, and significantly larger peacekeeping operation, the United Nations Mission in Sierra Leone (UNAMSIL).