Kosovo. Kosovo Polje. Young serbs girls wearing traditional clothes stand close to the memorial. The Battle of Kosovo (or Battle of Amselfeld) was fought on St Vitus' Day (June 15, now celebrated on 28) 1389 between the coalition of Serb lords and the Ottoman Empire. Even though the Serbian army had lost it decisively, The Battle of Kosovo is seen by many Serbs as the first defining moment of the rise of their nation. The Ottomans invaded and met the Balkan coalition Army under Prince Lazar on 28 June 1389 at Gazi Mestan. Kosovo (Albanian: Kosova) is a province of Serbia. While Serbia's sovereignty is recognised by the international community, in practice Serbian governance in the Kosovo province is virtually non-existent. © 1995 Didier Ruef ..