sentences:  This eventually led in 1991 to the outbreak of the civil war, the toppling of Barre's government, and the disbandment of the Somali National Army (SNA).Many of the opposition groups subsequently began competing for influence in the power vacuum that followed the ouster of Barre's regime.Armed factions led by USC commanders General Mohamed Farah Aidid and Ali Mahdi Mohamed, in particular, clashed as each sought to exert authority over the capital.