The Turco-Italian War was fought between the Kingdom of Italy and the Ottoman Empire from 29 September 1911, to 18 October 1912. As a result of this conflict, Italy captured the Ottoman Tripolitania Vilayet, of which the main sub-provinces were Fezzan, Cyrenaica, and Tripoli itself. These territories became the colonies of Italian Tripolitania and Cyrenaica, which would later merge into Italian Libya. The war was a precursor of the First World War. Members of the Balkan League, sensing Ottoman weakness and motivated by incipient Balkan nationalism, attacked the Ottoman Empire in October 1912, starting the First Balkan War a few days before the end of the Italo-Turkish War.