Opposition–Islamic State conflict during the Syrian civil war

Opposition–ISIL conflict during the Syrian civil war
	Part of the Syrian civil war and al-Qaeda–Islamic State conflict
Date	2 January 2014 – c. 2018; (4 years)
Location	Syria
Status	Syrian opposition victory
Belligerents
Free Syrian Army; Ahrar al-Sham; Jaysh al-Islam; Suqour al-Sham Brigades; Other rebel groups; Support: United States (2014–2017); Turkey; Qatar; Saudi Arabia; (2014–2017); France; (2014–2018); Al-Qaeda (2014–2017) Al-Nusra Front (until 2017); ; Hay'at Tahrir al-Sham (from 2017);	Islamic State
Commanders and leaders
Albay Ahmed Berri; (FSA Chief of Staff); Zahran Alloush †; (Islamic Front Military leader); Ahmed Abu Issa (former); (Islamic Front leader); Abu Khaled al-Suri †; (Ahrar ash-Sham senior leader) Abu Sa'ad al-Hadrami †; (al-Nusra Front Raqqa chief); Abu Mohammad al-Ansari †; (al-Nusra Front Idlib chief); Ahmed al-Sharaa; (HTS leader)	Abu Bakr al-Baghdadi †; Abu Ali al-Anbari † (Emir of Syria) ; Abu Ayman al-Iraqi †; (Head of military council); Abu Omar al-Shishani †; (ISIL field commander); Haji Bakr †; (Senior ISIL commander); Abu Baraa al-Jazairi †; (Emir of Saraqeb); Abu Dajana †; (Emir of Deir ez-Zor); Abu Mohammad Al-Massri †; (Emir of Manbij); Abu Haidara Al-Tounisi †; (eastern Qalamoun leader)
Strength
Free Syrian Army 60,000+; Islamic Front 40,000–70,000 Hay'at Tahrir al-Sham 15,000 (2022)	Islamic State 31,000–50,000
Casualties and losses
2,764+ killed	2,196+ killed
	605 civilians killed; 76 unidentified killed; an additional 1,200 combatants and 150 civilians estimated killed; Total: 5,641–6,991 killed; (up until 28 June 2014)

Opposition–ISIL conflict during the Syrian Civil War started after fighting erupted between Syrian opposition groups and the Islamic State of Iraq and the Levant (ISIL). In early January 2014, serious clashes between the groups erupted in the north of the country. Opposition groups near Aleppo attacked ISIL in two areas, Atarib and Anadan, which were both strongholds of the fundamentalist Sunni organization. Despite the conflict between ISIL and other rebels, one faction of ISIL has cooperated with the al-Nusra Front and the Green Battalion (a group of Saudi fighters) to combat Hezbollah in the Battle of Qalamoun. By 2018 the Islamic State was destroyed in the territories held by the opposition.