Eastern Qalamoun offensive (September–October 2016)

Eastern Qalamoun offensive (September–October 2016)
	Part of the Rif Dimashq Governorate campaign of the Syrian Civil War
Date	3 September – 15 October 2016 ; (1 month, 1 week and 5 days)
Location	Eastern Qalamoun Mountains, Rif Dimashq Governorate, Syria
Result	Both sides capture or recapture territory; Government forces bombard ISIL positions in the region;
Belligerents
Syrian Opposition; Syrian Government;	Islamic State of Iraq and the Levant
Commanders and leaders
Harith Siwar (WIA); (Eastern Qalamoun Jaysh al-Islam commander); Salih Nouman †; (Eastern Qalamoun Jaysh al-Islam commander); Abdul Rahman Abu Mansour; (Al-Rahman Legion deputy commander); Abu Barzan; (Lions of the East Army deputy commander)	Unknown
Units involved
Free Syrian Army Southern Front Forces of Martyr Ahmad al-Abdo; Lions of the East Army; ; Authenticity and Development Front; Sham Liberation Army; Al-Rahman Legion; ; Jaysh al-Islam; Ahrar al-Sham; Jabhat Fateh al-Sham; Syrian Armed Forces Syrian Air Force; ;	Military of ISIL Wilayat Dimashq; ;
Strength
600–1,500 fighters Helicopters and fighter jets	Unknown
Casualties and losses
24 fighters killed 1 MiG-23 crashed	23–62 militants killed

The Eastern Qalamoun offensive was a large-scale military offensive against Syrian rebel positions in the eastern Qalamoun Mountains of the Rif Dimashq Governorate launched by the Islamic State of Iraq and the Levant along a frontline of more than 15 kilometers in the region.