A major role in the Hamidian massacres of 1894-96 has been often ascribed to the "Hamidiye" regiments, particularly during the bloody suppression of Sasun (1894). On July 25, 1897 the Khanasor Expedition was against the Kurdish Mazrik tribe (Muzuri Kurds) who owned a significant portion of this cavalry. The first notable battle in the Armenian resistance movement took place in Sassoun, where nationalist ideals were proliferated by Hunchak activists, such as Mihran Damadian, Hampartsoum Boyadjian, and Hrayr. The Armenian Revolutionary Federation also played a significant role in arming the people of the region. The Armenians of Sassoun confronted the Ottoman army and Kurdish irregulars at Sassoun, succumbing to superior numbers. This was followed by Zeitun Rebellion (1895–1896), which between the years 1891 and 1895, Hunchak activists toured various regions of Cilicia and Zeitun to encourage resistance, and established new branches of the Social Democrat Hunchakian Party.