The Kumanovo Uprising took place in early 1878 organized by an assembly of chiefs of the districts (Ottoman "kaza") of Kumanovo, Kriva Palanka and Kratovo in the Vilayet of Kosovo (in modern-day northern Republic of North Macedonia) seeking to liberate the region from the hands of the Ottoman Empire and unify it with the Principality of Serbia, which was at war with the Ottomans at that time. With the Serbian Army's liberation of Niš (11 January 1878) and Vranje (31 January 1878), the rebellion had been activated during the latter event with guerrilla fighting. The rebels received secret aid from the Serbian government, though the uprising only lasted four months, until its suppression by the Ottomans.