Following a brief war in Slovenia, and months of skirmishes and minor fighting in Croatia, during the autumn of 1991 the crisis in Yugoslavia culminated in an all-out war. The task of the Yugoslav Air Force and Air Defence (JRV i PVO) was to support friendly forces, foremost in regards of unblocking dozens of garrisons of the Yugoslav National Army (JNA), which the Croats were besieging. Decades of ideological pressure during the Communist era and the ideology of brotherhood and unity of the ethnic- and religious communities in the multinational Yugoslavia created an independent political factor within the federal armed forces. However, in the fall of 1991, the top brass of the armed forces lacked a clear- and realisable plan. Following several bitter battles, and extensive negotiations, the Croatian authorities have left many of the besieged JNA units to go. However, the Serbs in Croatia, supported by the federal armed forces, then continued to fight for the control over the areas