Who are Hayat Tahrir al-Sham and the Syrian groups that took Aleppo?

Syrian opposition fighters have launched a lightning offensive, capturing most of Aleppo and arriving as far south as Hama in a matter of days as government forces retreated.

The rebels’ rapid gains – the most significant since 2016 – have thrust Syria’s various opposition factions back into the spotlight.

Hayat Tahrir al-Sham (HTS)

HTS is the biggest fighting group in Operation Deterrence of Aggression.

Formerly Jabhat al-Nusra, then Jabhat Fateh al-Sham, it is a group of allied factions, including Jabhat Fateh al-Sham, Liwa al-Haqq, Jabhat Ansar al-Din and Jaysh al-Sunna.

At the start of the Syrian war, Jabhat al-Nusra was formed in 2012 by ISIL (ISIS), from which it split a year later and declared allegiance to al-Qaeda.

It severed ties with al-Qaeda and joined with other factions to rebrand as HTS in 2017.

HTS in effect controls Idlib and is estimated to have up to 30,000 fighters.

It also has economic control over swaths of territory and the resources there, including petroleum, which is a significant source of income for it as is the Bab al-Hawa border crossing with Turkiye.

HTS is largely self-funded and is understood to control the SSG, even announcing to the people of Aleppo that the various SSG ministers based in Idlib would now be serving Aleppo as well.

National Front for Liberation (NFL)

A number of the smaller fighting groups that make up the NFL participated in Operation Deterrence of Aggression, including the Jaish al-Nasr, Sham Corps and Free Idlib Army.

Established in Idlib in 2018, the NFL includes several northern Syrian factions, some of which also fall under the umbrella of the Free Syrian Army.

Like on many fronts, the NFL came together to counter threats by the regime to advance on Idlib.

Ahrar al-Sham Movement

Mostly active in Aleppo and Idlib, Ahrar al-Sham was established in 2011 as government forces violently repressed the Syrian revolution.

Its fighting force was estimated at more than 15,000 according to 2015 estimates.

It defines itself as a “comprehensive reformist Islamic movement, included and integrated within the Islamic Front”.