In 1918 the leader of the Russian Bolsheviks Vladimir Lenin appointed Stephan Shaumyan the extraordinary Commissar of the Caucasus and sent him to Baku. The Bolsheviks seized power in Baku and created conditions for the Armenian armed formations to realize their secret purposes. On March 31, began the mass slaughters of the Azerbaijanis in the city of Baku. By the acknowledgements of Stephan Shaumyan, 6000 armed soldiers of the Baku Soviet and 3000 armed men from “Dashnaksutyun” party took part in the massacre of the peaceful Azerbaijanis.
During the massacre that lasted 3 days, the Armenians suddenly attacked the Azerbaijani quarters with the help of the Bolsheviks and killed both children and the elderly. A German by surname of Kulner, who had witnessed the horrible events of those days, wrote in 1925: “The Armenians rushed into the Azerbaijani quarters, killed, sabred, bayoneted everybody, and made holes in them. Several days after the massacre 87 corpses of Azerbaijanis excavated from a pit provided evidence that their ears, noses, genitals had been cut and their bodies bayoneted and sabred. The Armenians pitied neither the children, nor the old.”
In general, in two massacres in the Transcaucasus during the first half of the 20th century (1905-1907, 1918-1920) about 2 million Azerbaijanis and Turks were killed, wounded and driven from their homes by the Armenians.
In the March massacre a pit was found in Baku with the corpses of 57 Azerbaijani women with ears and noses cut off and with bellies torn open. There were cases when young women were nailed to the wall, the city hospital where 2000 people had found shelter was burned completely.
The Armenians had installed machine-guns in various places of the city in order to shoot the people trying to escape.
Avanes Apresyan, an Armenian officer, one of the active participants in the massacre of the Azerbaijanis in the provinces of Irevan, Sharur-Dereleyez, Surmeli, Kars and in other territories, in his memoirs titled, “Men were like this”, writes that they achieved their goal with the help of the English and Russians and murdered 25,000 Azerbaijanis during the March massacre only in Baku.
The genocide of the Azerbaijanis by the Dashnaks was not limited to Baku only. Within a brief period of time, the Armenians committed massacres in Shamakhi, Guba, Irevan, Zengezur, Karabakh, Nakhchivan and Kars.
In March-April of 1918 about 8000 civilians were slaughtered in Shamakhi. The majority of the Moslem monuments of culture, including the Friday Mosque of Shamakhi, were set on fire and burnt.
28 villages in the province of Javanshir and 17 villages in the province of Jabrail were completely burned, and the population slaughtered.
On April 29, 1918, a group of refugees, mainly women, children and old people, 3000 in number, encountered an ambush of armed Armenians and all were murdered.
The armed Armenian formations set on fire several villages in the province of Nakhchivan, completely destroyed 115 Azerbaijani villages in the province of Zengezur, while killing 3257 men, 2276 women, and 2196 children. In all, 10,068 Azerbaijanis were murdered and disabled, and 50,000 became refugees in this province.
In the province of Irevan 135.000 Azerbaijani residents of 199 villages were murdered and the villages were completely destroyed. Then the Armenian armed formations attacked Karabakh, and 150 villages in the Nagorno-Karabakh were destroyed and the population of these villages was ruthlessly murdered (according to materials of the Extraordinary Investigation Commission, the government of the Azerbaijan Democratic Republic).
In May 1920, over 12,000 Azerbaijanis were murdered in Ganja by the Armenians, along with the XI Red Army of the Soviets.

http://www.human.gov.az
PS: Some corrections have been made in the article.