On 3 October, 23 soldiers were reportedly killed after a failed attempt to regain control over Deir al-Adas. The next day, rebels announced the start of a military operation called "wa al-Fajr wa Layali Asher", which aimed to capture al-Harra town and its 1,075 meters high strategic hill and to besiege Army forces in al-Sanamayn and its surrounding barracks. That day, between 18 and 60 rebels were killed. On 5 October, at least 30 soldiers and 29 rebels were killed at Tell al-Harrah and at its radar base. The rebels captured the hill, Zimrin village and the Oum El-Aaoussaj barrier in al-Harrah town. According to opposition sources, two army tanks were destroyed and one fighter jet was downed, while rebels also managed to capture the Tell al-Ahmar and the security facilitity in the south of al-Harrah town and the al-Jadeera checkpoint east of it. The base on the hill contained Center C, a spy facility run by a Russian special unit. The next day, rebels captured the village of Zimrin, the two strategic hills surrounding it, and two checkpoints nearby. That day, 16 rebels and six members of the same family were killed.
Aftermath
On 10 October, the Syrian Army started bombing al-Harrah town from the air and with ground-to-ground missiles, killing 20 civilians. On 15 October, the Syrian brigadier-general “Mahmud Abo Arraj”, commander of the Brigade 121 affiliated to the Seventh Division, fled his home in Damascus to the Syrian-Jordanian border after hearing he will be on trial and executed on charge of high treason due to "handing over al-Harrah Hill". He was likely killed in Rif Dimashq, but his body is still missing. On 17 October, rebels announced the start of a new battle called “Ahlo al-Azem", which aimed to capture the following Army checkpoints: Umm al-Mayazen al Tebeh, Al-Ma’esra checkpoint and Al-Kazeyyat checkpoint. These checkpoints are located along the Damascus-Jordan highway and are considered the biggest of their kind in the eastern area. On 20 October, rebels captured the al-Jeser, al-Falahin gas station and al-Ma'sara checkpoints near Umm al-Mayazan after three days of fighting. Umm al-Mayazan village was captured by the rebels the next day after heavy fighting with pro-government troops, who withdrew from the village and reportedly inflicted heavy casualties on the rebels. That same day, at least 8 civilians were killed after the Syrian Arab Air Force bombed the Nasib border town. On 23 October, rebels captured the Umm al-Mayathen checkpoint near Nasib border crossing.
