 It was the first serious defeat of the Ottomans in the Balkans..The Ottoman army next campaigned in Bosnia, fighting Bosnian troops led by Vlatko Vuković and Radič Sanković at Bileća (1388), ending in a decisive Bosnian victory, then in Kosovo, fighting Serbian troops at the Kosovo field (1389), ending inconclusively.Murad had decided to make one more powerful thrust aimed at the heart of the now seemingly revitilised Serbian Empire — Kosovo.Both Lazar and Murad fell in that battle.