Deir ez-Zor offensive (December 2014)

Deir ez-Zor offensive (December 2014)
	Part of the Siege of Deir ez-Zor (2014–2017)
Date	3–13 December 2014; (1 week and 3 days)
Location	Deir ez-Zor, Deir ez-Zor Governorate, Syria
Result	Partial ISIL victory ISIL captures al-Mari'iyah, al-Jafra, the Missiles Battalion base and the mountain overlooking Deir ez-Zor city; Syrian government forces recaptures the mountain, the base, and most of al-Mari'iyah and al-Jafra;
Belligerents
Islamic State	Syrian Government; Al-Shaitat tribes
Commanders and leaders
Amer Al-Rafdan; (ISIL top commander); Abu al Faruq †; (Tunisian ISIL Deir ez-Zor commander); Van Manco; (Filipino ISIL commander)	Brig. Gen. Issam Zahreddine; (Republican Guard commander); Mudar Makhlouf; (Military Intelligence militia commander); Rafaa Aakla al-Raju
Units involved
Military of ISIL	Syrian Armed Forces Syrian Army 17th Mechanized Division 137th Mechanized Brigade; ; Republican Guard 104th Airborne Brigade ; ; ; National Defence Forces; Military Intelligence militia contingents; ;
Strength
3,000+ militants (by September)	150 soldiers (reinforcements); 200 tribal fighters
Casualties and losses
250+ militants killed; (by 6 December)	43–51 soldiers killed; (by 6 December)

The Deir ez-Zor offensive (December 2014) was a military operation launched by the Islamic State (IS) on the Deir ez-Zor Airport and the surrounding areas.