Massacres of Azerbaijanis in Armenia (1917–1921)
In the aftermath of World War I and during the Armenian–Azerbaijani and Russian Civil wars, there were mutual massacres committed by Armenians and Azerbaijanis against each other. While a significant portion of the Muslim population (mostly Tatars) of the Erivan Governorate were displaced during the internecine conflict due to the actions of Armenian irregulars and militias, the government of Armenia pursued a policy of ethnic homogenisation in affected areas. Starting in 1918, Armenian partisans expelled and massacred thousands of Azerbaijani Muslims in Zangezur and destroyed their settlements in an effort to "re-Armenianize" the region. These actions were cited by Azerbaijan as a reason to start a military campaign in Zangezur. Ultimately, Azerbaijan took in and resettled tens of thousands of Muslim refugees from Armenia. The total number of killed is a matter of scholarly dispute. By the outset of Armenia's independence, the country's Turkic population was more than 10 thousand. Background

Following the Russian annexation of Iranian Armenia, tens of thousands of Armenians repatriated to Russian Armenia in 1828–1831, thereby regaining an ethnic majority in their homeland for the first time in "several hundred years". Despite this, the Russian Empire census indicated there to be over 240 thousand Muslims on the territory of present-day Armenia in 1897, indicated by previous censuses to be mostly Tatars (forming over 30 percent of the population). As a result of rising nationalism in the South Caucasus, ethnic clashes erupted between Armenians and Tatars in the Russian Empire between 1905 and 1907, resulting in massacres of thousands of Armenians and Azerbaijanis and the destruction of hundreds of Armenian and Tatar villages. Until the Ottoman invasion of the South Caucasus in 1918, Armenians and Tatars lived "relatively peacefully" throughout the First World War. Tensions rose after both Armenia and Azerbaijan became briefly independent from Russia in 1918 as both engaged in a war over their mutual borders. Events

Expert on the Nagorno-Karabakh conflict, Thomas de Waal wrote that Azerbaijanis in Armenia became the "collateral victims" of the Armenian genocide carried out by the Ottoman Empire years prior; also adding that despite Azerbaijanis being represented by three delegates in an eighty-seat Armenian parliament, they were universally targeted as "Turkish fifth columnists". In the aftermath of World War I, and during the Armenian–Azerbaijani war and Russian Civil War, there were mutual massacres committed by Armenians and Azerbaijanis against each other. The Erivan Governorate, which formed a part of the Armenian republic, had a "significant Muslim population until 1919." The British journalist C. E. Bechhofer Roberts commented on the state of affairs in April 1920 as "no day went by without a catalogue of complaints from both sides, Armenian and Tartar, of unprovoked attacks, murders, village burnings and the like. Superficially, the situation was a series of vicious circles. Tartar and Armenian attacked and retaliated for attacks. Fear drove on each side to fresh excesses." In the Erivan Governorate and Kars Oblast 
Mustafa Kemal, the leader of the Turkish National Movement, in justifying an invasion of Armenia, stated that reportedly nearly 200 villages were burned by Armenians and most of their 135 thousand inhabitants were "eliminated". Historian Richard Hovannisian wrote that nearly a third of the 350 thousand Muslims of the Erivan Governorate were displaced from their villages in 1918–1919 and living in the outskirts of Yerevan or along the former Russo-Turkish border in emptied Armenian homes. In 1919, the Armenian government declared the right of return of all refugees, however, this was unimplemented in emptied Muslim settlements occupied by Armenian refugees. During his tenure as minister of war, Rouben Ter Minassian transferred many of the 30 thousand Armenian refugees from eastern Anatolia, to replace evicted Muslims and homogenise certain areas, including Erivan (present-day Ararat) and Daralayaz. Ter Minassian, displeased with the fact that Azerbaijanis in Armenia lived on fertile lands, waged at least three campaigns aimed at cleansing Azerbaijanis from 20 villages outside Erivan, as well as in the south of the country. Oliver Wardrop traveled through Armenia in October 1919 and wrote that along much of Lake Sevan lay deserted houses "in ruins from internecine conflicts between Armenians and Tatars." In October 1919, Muslim authorities in Kars appealed to Azerbaijan for means to transport 25 thousand refugees. In Zangezur

Throughout 1918–1921, Armenian commanders Andranik Ozanian and Garegin Nzhdeh brought about a "re-Armenianization" of Zangezur through the expulsion of tens of thousands (40–50 thousand) and the massacre of 10 thousand Azerbaijanis. A message dated 12 September from the local county chief indicated that the villages of Rut, Darabas, Agadu, Vagudu were destroyed, and Arikly, Shukyur, Melikly, Pulkend, Shaki, Kiziljig, the Muslim part of Karakilisa, Irlik, Pakhlilu, Darabas, Kyurtlyar, Khotanan, Sisian, and Zabazdur were set aflame, resulting in the deaths of 500 men, women, and children. In the Barkushat–Geghvadzor valleys and southeast of Goris, nine villages and forty hamlets were "wiped out" in January 1920 in an act of retribution for the massacre of Armenians in Agulis. The number of Muslim settlements in Zangezur destroyed by Andranik and Nzhdeh is given by different authors as 24, 49 (9 villages and 40 hamlets), or 115. The destruction of these settlements and the restriction imposed by local Armenians on Muslim shepherds taking their flocks into Zangezur was cited by Azerbaijan as the reason for their military campaign against Zangezur in late-1919. According to Mark Levene,  250 Muslim villages had been burnt in the eastern Caucasus by May 1918—as a result of a killing spree initiated by Armenian units led by Andranik. Casualties and displaced persons

Aftermath
Following Armenia's sovietisation in 1920, "more than 10 thousand Turks" remained within the borders of Armenia. According to the soviet agricultural census by 1922, 60 thousand Azerbaijani refugees (also known as Turko-Tatars) repatriated, bringing their total up to 72,596 - 77,767. In April 1920, the archbishop of Yerevan, Khoren I of Armenia wrote "I must admit that a few Tatar villages...have suffered... but, every time...they were the aggressors, either they actually attacked us, or they were being organised by the Azerbaijan agents and official representatives rise against the Armenian Government." To assist the destitute 70–80 thousand Muslim refugees living south of Yerevan (50 thousand of whom were dependent on relief aid during the winter), the Azerbaijan Democratic Republic transferred large amounts of funds. It was reported in 1919–1920 that there were 13 thousand Muslims in Yerevan and another 50 thousand throughout Armenia. Muslims, in contrast with their coreligionists in the south of the country lived "acceptably" and with "generally cordial" interethnic relations in the north. The 40 thousand Muslims who had fled from Armenia to Azerbaijan were resettled through a 69 million ruble allocation by the Azerbaijani government. Contemporary assessment
Turkish-German historian Taner Akçam criticized Turkish efforts to equate these events with the previous Armenian genocide. He also criticized the death figures in primary sources for often being "freely invented by the authors" and exaggerations of "destroyed villages" referring to settlements of 4–5 inhabitants. Besides this, Akçam also criticizes accounts under which the Muslim deaths are just further revenge killings typical of the period:There is no doubt that the events in Caucasus [between 1917 and 1922] were part of a historical continuity in the region. However, while there is continuity of the actors, there are significant changes to the context in which these events took place. The decline of empires and rise of new nation-states changed the nature of the events in very important ways that negate a description of Muslim deaths during this period as simply "acts of revenge." The newly formed Armenian state was itself attempting to establish an ethnically homogenous nation. See also
Deportation of Azerbaijanis from Armenia
Anti-Azerbaijani sentiment in Armenia
Demographics of Armenia
Armenians in Azerbaijan

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Bibliography

Anti-Azerbaijanism
Massacres in Armenia
Massacres in Russia
Massacres of Muslims