Fedayi, also known as the Armenian irregular units or Armenian militia, were Armenian civilians who voluntarily left their families to form self-defense units and irregular armed bands in reaction to the mass murder of Armenians and the pillage of Armenian villages by criminals, Turkish and Kurdish gangs, Ottoman forces, and Hamidian guards during the reign of Ottoman Sultan Abdul Hamid II in late 19th and early 20th centuries, known as the Hamidian massacres. Wikipedia