The United Nations Operation in Somalia II (UNOSOM II) was the second phase of the United Nations intervention in Somalia and took place from March 1993 until March 1995, following the outbreak of the Somali Civil War in 1991. UNOSOM II carried on from the transitory United States-controlled (UN-sanctioned) Unified Task Force (UNITAF), which had been preceded by UNOSOM I. Notably, UNOSOM II embarked on a nation-building mission, diverging from its predecessors. As delineated in UNSCR 814, the operation's objectives were to aid in relief provision and economic rehabilitation, foster political reconciliation, and re-establish political and civil administrations across Somalia.
UNOSOM II was a substantial multinational initiative, uniting over 22,000 troops from 27 nations. This operation marked the largest multilateral force ever assembled for peacekeeping, and at that time, it was the costliest UN operation. The operation abandoned the careful rules of engagement set by UNITAF, and notably was the first UN mission authorized from the start to use military force proactively, beyond self-defense.