The Battle of Kumanovo or the Battle of Kumanova (Macedonian and Serbian Cyrillic: Кумановска битка) on 23–24 October 1912 was a major battle of the First Balkan War. It was an important Serbian victory over the Ottoman army in the Kosovo Vilayet, shortly after the outbreak of the war. After this defeat, the Ottoman army abandoned the major part of the region, suffering heavy losses in manpower (mostly due to desertions) and in war .