Greece took action to apply its plans on the lands of the Ottoman Empire upon signing of the Treaty of Mudros. In order to realise its aim for the irredentist policy towards Turkish lands, Greece collaborated with the Phanar Greek Patriarchate. The aim of Greece was to found a great Greece whose capital was to be Istanbul. Greece, which carried out the occupation politics within a certain plan, wished to take the support of the European States with the allegations that it put forward, while following a serious settlement politics in Anatolia by organizing Greeks within the Ottoman State. The Greeks spreaded fear and horror to the Turkish people in order to strengthen their claims and to ensure Greek settlement, thus forced them to migrate from where they resided. Greece carried out all these activities by availing itself, to a great extent, of the Phanar Greek Patriarchate and the organizations that it caused to be established through the Patriarchate. The weapons and ammunition brought by Greek ships coming to Anatolia seemingly for humanitarian purposes were hidden in the churches and these weapons were shipped to the gangs created in Anatolia. This study will focus on the scope of the organizational activities that Greece has shown with the help of the Phanar Greek Patriarchate in Istanbul for the purpose of facilitating occupations in Turkey during the Armistice and National Struggle period.