sentences:  Armenia and the Armenian diaspora have been campaigning for official recognition of the events as genocide for over 30 years.These events are traditionally commemorated yearly on 24 April, the Armenian Martyr Day, or the Day of the Armenian Genocide.Although the Russian Caucasus Army of Imperial forces commanded by Nikolai Yudenich and Armenians in volunteer units and Armenian militia led by Andranik Ozanian and Tovmas Nazarbekian succeeded in gaining most of Ottoman Armenia during World War I, their gains were lost with the Bolshevik Revolution of 1917.