At the start of the 20th century, Greece was involved with the Macedonian Struggle, military conflicts against the Bulgarian organization known as the Internal Macedonian Revolutionary Organization, and Turkish forces in Ottoman-occupied Macedonia. Many volunteers from Mani took part in the war such as soldiers from the Dritsakos, Koutsonikolakos, Kosteas, Georgopapadakos, Iliopiereas, Loukakos, Kyriakoulakos, and Kalantzakos families. The Maniots also took part in the series of wars that followed including the Balkan Wars, World War I, and the Greco-Turkish War (1919-1922). The participation of troops from Mani in these wars under Constantine I of Greece, created strong royalist feelings amongst Maniots. That is why most Maniots remained loyal to Constantine during the Greek National Schism.