These acts of killing and explusion culminated in the Balkan Wars of 1912-13, when
Serbia, Greece, Bulgaria and
Montenegro finally destroyed the Ottoman Empire in Europe. According to Justin McCarthy (Death and Exile: The Ethnic Cleansing of Ottoman Muslims, 1821-1922, Darwin Press, Princeton, 1996, p. 164), the Balkan Wars resulted in the
death of 27% of the Muslim population of the Ottoman territories conquered by the Christian Balkan states - 632,408 people.
Source.