Koča's Frontier
Koča's Frontier (Serbian: Кочина крајина, Kočina krajina) refers to the territory liberated by Serbian rebels in the Sanjak of Smederevo (Ottoman Empire), during the Austro-Turkish War of 1788–1791. Rebellion was planned already in 1787, since it was anticipated that the Habsburg Monarchy will enter into war against the Ottomans.