[20][better source needed] Tahrir al-Sham was formed by five Salafist rebel groups in Syria, including the al-Nusra Front and the Nour al-Din al-Zenki Movement, on 28 January 2017.

[23] On 18 February 2018, Ahrar al-Sham and the Nour al-Din al-Zenki Movement announced a merger which established the Syrian Liberation Front.

[30][31] On 19 February 2018, a day after the Syrian Liberation Front was established, clashes erupted between the SLF and HTS in western Aleppo and northern Idlib.

[32] On 24 February, Hassan Soufan, general commander of the Syrian Liberation Front, called on the Sham Legion, who did not comment on the clashes, to side with the SLF against HTS.

[12] During a brief battle on 26 February, mere hours after the loss of Darat Izza to the SLF, HTS reportedly captured the largest base of Ahrar al-Sham, Khirbet Bantanta Military Camp, located in northern Idlib province, thus securing a large stash of weaponry, including 20 tanks, towed artillery pieces, multiple rocket launchers, self-propelled guns and infantry fighting vehicles.

[33] On 27 February, HTS withdrew from the city of Khan Shaykhun, and was expelled from western Aleppo, although it repelled the SLF advance on al-Dana.

[34][35][36] During the last day of February, HTS launched a large-scale counter-offensive, capturing settlements of Kafr Losen, Aqrabat, Deir Hassan, and Qah, as well as attacking the town of Atmeh.

[39][better source needed] On 2 March, Tahrir al-Sham advanced to the outskirts of the SLF stronghold of Atarib with an estimated 1,500 fighters and 30 tanks, along with other vehicles.

The newly formed al-Qaeda faction Guardians of Religion Organization, specifically, Jaysh al-Sahel, threatened to engage the SLF if they attack certain villages.

[42] Several tribal forces are to be deployed to Idlib from Turkey after clan leaders in Urfa had a meeting with Turkish President Recep Tayyip Erdogan to discuss the framework and development of a council.

Attacked west of Kafr Nabl, the SLF captured three towns along a road, further isolating HTS garrisons in southern Idlib governorate.

[45][better source needed] A media channel linked to SLF and Suqour al-Sham claimed the killing of 3 HTS commanders in Jabal Zawiya.

[49][better source needed] On 7 March, Tahrir al-Sham captured settlements of Kafr Naha, al-Sa’adiyah and A’jil from SLF in the Aleppo Governorate, as well as housing complexes of al-Arman, al-Fursan and al-Rahal.

The agreement includes release of prisoners on both sides, cessation of attacks, and opening of roads leading to the front lines with the Syrian Arab Army and its allies.

[54][better source needed] On 22 March, reports emerged that Tahrir al-Sham and SLF are expected to resume clashing soon, as the temporary ceasefire ended today as the parties were unable to successfully negotiate a truce.

On the same day unknown gunmen stormed the headquarters of the Sham Legion in Idlib killing four of their members there is evidence that suggests that Jund al-Aqsa is behind the attack which has cells and remnants active in Tahrir al-Sham, Guardians of the Religion organization, the Turkistan Islamic Party, as well as a new group consisting of 300 former members of the group called Ansar al-Tawhid.

In the Dara Governorate demonstrations were held demanding that Tahrir al-Sham withdraw from a locality in hopes of keeping the area neutral in the conflict.

On 11 April, Tahrir al-Sham arrested incoming Jaysh al-Islam commanders that evacuated to Idlib after the Rif Dimashq offensive (February–April 2018), due to per-existing rivalries between the two.

[76] On 16 April, the Syrian Liberation Front recaptured a few villages in western Aleppo from Tahrir al-Sham and claims to have killed 3 individuals linked to the Turkistan Islamic Party in Syria.

[79][better source needed] On 27 April, after a mass assassination campaign against multiple opposition groups in Idlib began, an IED was targeted Saudi cleric Abdullah al-Muhaysini near Saraqib after he was leaving a meeting to mediate a prisoner exchange between HTS and SLF.

[80][better source needed] On 29 April, the assassinations for the 4th continued day, with the killing of 2 Hayyaat Tahrir Al-Sham members and a lieutenant from the SAA who defected, by an IED.

[84][better source needed] In January 2019, HTS seized control of dozens of villages from Nour al-Din al-Zenki, forcing National Front for Liberation to sign a ceasefire deal.