Deir ez-Zor offensive (September–November 2017)
The Deir ez-Zor offensive was a military operation launched by the Syrian Armed Forces to completely expel the Islamic State of Iraq and the Levant (ISIL) from the city of Deir ez-Zor, a provincial capital, located on the banks of the Euphrates river. From 2014 until 2017, the city had been divided into Syrian government and ISIL-controlled halves. The rest of the Governorate (province) was under ISIL control for most of this time, putting the government-controlled half of the city under siege.
For others offensives in Deir ez-Zor, see Deir ez-Zor clashes.