The Greater-Serbian aspirations in Western Slavonia occurs after the founding of the Serbian Democratic Party under the leadership of Jovan Rašković. There was a referendum on autonomy, where almost all Serbs in the municipalities of Western Slavonia pleaded for autonomy. The culmination of Greater-Serbian aspirations took place after the decision on the proclamation of the SAO Western Slavonia on August 12, 1991, and included Western Slavonia in the composition of SAO Krajina. The rapid response of the forces of the Croatian Army followed the three military operations of the code-named Otkos-10, Orkan-91 and Papuk-91. On January 3, 1992, the Sarajevo Agreement was signed and all further actions for the release of the remaining occupied territory of the Republic of Croatia were suspended. The arrival of UNPROFOR forces has been followed with the goal of normalizing life. The final phase of the liberation of Western Slavonia is made by the military operation Flash, which lasted from 1 to 4 May 1995. With Operation Flash, about 500 square kilometers of the surface of the Republic of Croatia was liberated and all the goals of the West Slavonian battlefield were achieved.