 Complete the following phrase:  After the fall of the Russian Empire in 1917, the Armenian, Georgian and Muslim leaders of Transcaucasia united to form the Transcaucasian Federative Republic and proclaimed Transcaucasias secession. However, it was a fragile short-lived federation that collapsed in May 1918, while the Turkish army was advancing towards Eastern Armenia through Gyumri, Aragatsotn and Sardarapat. On May 21, 1918, the Turkish forces attacked through Aparan in Aragatsotn trying to reach Yerevan. The Turks were opposed by the Armenian forces under the command of Dro at the outskirts of Aparan. After three days of fierce fighting, the Armenians launched a counter-attack on 25 May, and the Turkish troops were forced to retreat back to the north on 29 May. As a result of the decisive victories over the Turks in the battles of Sardarabad, 