The relatively benign environment at the beginning of the mission gave way to chaos as the civil war re-escalated following the assassination of President-elect Bashir Gemayel in September 1982 . Subsequent political and military developments on the ground caused the MNF to be viewed not as a peacekeeper , but as a belligerent . In early 1984 , after it became apparent that the government of Lebanon was no longer able to impose its will on warring factions as they entered Beirut and hostilities renewed , the MNF ended its presence mission in Beirut and went offshore before completely leaving Lebanon in July of the same year in the aftermath of the October 1983 barracks bombing that killed 241 U.S. and 58 French servicemen . It was replaced by the United Nations Interim Force in Lebanon ( UNIFIL ) already present in Lebanon since 1978 under the leadership of Ghanaian Lieutenant General Emmanuel Erskine
barracks bombing
1983 Beirut barracks bombings
Multinational Force in Lebanon