Hasan Tahsin was the code name of Osman Nevres (1888 – 15 May 1919), a Turkish nationalistBozkurt Güvenç, Türk Kimliği, Kültür Bakanlığı, 1993, pg. 32. Yaşar Aksoy, Hasan Tahsin’in Anlamı , Haberhüriyeti and journalist of Dönmeh descent.Arda Sualp - M. Ali Eren, "Cumhuriyet hanedanları" , Aksiyon, Sayı: 51 / Tarih : 25 November 1995.Ilgaz Zorlu, Evet, ben Selânikliyim: Türkiye Sabetaycılığı, Belge Yayınları, 1999, p. 95. Abdurrahman Küçük, Dönmeler ve Dönmelik Tarihi, Ünal Matbaası, 1979, pg. 237. Orhan Türkdoğan, Osmanlı'dan Günümüze Türk Toplum Yapısı, Çamlıca Yayınları, 2002, pg. 166.
Hailed as a Turkish war hero, his name has been given by the Turkish Armed Forces to the Information Center of the Turkish General Staff (Genelkurmay İletişim Başkanlığı'nın Hasan Tahsin Bilgi Merkezi). A member of the Ottoman Special Organization, he unsuccessfully tried to assassinate Noel and Charles Roden Buxton in Romania during World War I."Teşkilat-ı Mahsusa üyesi Hasan Tahsin", Hürriyet, 17 Mayıs 2009 He was sentenced to five years imprisonment for the attempt but released when German forces overran Romania.
He opened fire on the Greek soldiers who landed at Smyrna (present day İzmir) on 15 May 1919Yaşar Aksoy, Jülide Tunaseli, Love for 70 years: Izmir Fair, Metropolitan Municipality of Izmir, 2001, pg. 1. in the opening act of the Greek occupation of more than three years that extended over a large part of western Anatolia, as well as of the Greco-Turkish War. He was killed on the spot on 15 May 1919 after killing the Greek standard-bearer. At the time of his death he had been publishing and writing for the newspaper Hukuk-u Beşer (Ottoman Turkish for Human Rights).
References
Report of the Inter-Allied Commission of Inquiry (May-September 1919) by the Members of the Commission; Adm. Bristol, the US Delegate - Gen. Hare, the British Delegate - Gen. Bunoust, the French Delegate - Gen. Dall'Olio, the Italian Delegate. The statements in defense of the Greek government presented by Col. Mazarakis.