In the evening of 20 May, the retreating troops of the 1st Special Brigade – the Regiment of Erzincan and half a battalion from the Regiment of Khnus (under the command of Karapet Hassan-Pashaian) – moved deeper from Sardarapat to the village of Khznauz. As a result of the Turkish invasion in Alexandropol-Yerevan direction, the groups defending Surmali were in danger of being cut off from the main forces of the Yerevan detachment and surrounded by the Ottomans. On 18 May, Ottoman forces attacked the Armenian unit in Koghb, which, by Silikyan's order, withdrew towards the Karakala bridge. On 19 May, the military units of the 4th Turkish Corps invaded Surmali from Bayazet, seeking to cross the Araks River and reach the rear of the Yerevan detachment. After showing some resistance in mountain passes and high grounds near Igdir, the Armenian units (1st and 2nd regiments of Van) had to retreat to Igdir on 20 May, where they received an order from Yerevan to cross to the left bank of Araks across the bridge of Margara, burning down the aforementioned bridges afterwards. After capturing Surmali, the Ottoman forces were thus cut off from the Sardarapat theater. The Armenian volunteers arranged the defense of the bridges, thwarting any attempt by the Turks to cross the river and attack the Armenians from the rear. By the order of Silikyan, some of the 3rd Special Brigade subdivisions (4th regiment of Van, under the command of Colonel Tigran Baghdasaryan) were stationed in those areas to defend the rear from the south and prevent the Ottomans from crossing the river. Course of the battle Armenian counter-offensive On 21 May, the 108th Turkish Infantry Regiment, including cavalry and infantry subdivisions, went on with their offensive from an area adjacent to Araks railway station. The Sardarapat detachment, conducting defensive artillery operations, started to retreat and withdrew to the Kurakanlu-Kyorpalu-Zeyva Hayi initial positions. The Turks came close to Kyorpalu (7 km west of Etchmiadzin). Advancing along the railroad, on 21 May, the detachment of Zihni Bey overtook an Armenian unit composed of 600 infantry and 250 cavalry, and then took Sardarabad. (now in the territory of the city of Armavir) that evening and the village of the same name 2 km south of the station, as well as the village of Gechrlu. Keeping up with their attack, the Turkish forces took the Verin Kolibeklu settlement (now in the