[1] On 1 August, the Syrian Liberation Front, which was formed by Ahrar al-Sham and the Nour al-Din al-Zenki Movement in February 2018, as well as Jaysh al-Ahrar and the Damascus Gathering, joined the formation.

[13] On the same day, a group of around 200 fighters formed the Free Hayan Brigade and joined the NFL in order to "unite factions", "fight forces of the Syrian regime", and avoid rebel infighting.

[16][17] On 26 March 2019, the National Front for Liberation released a statement declaring its rejection and condemnation of the United States recognition of the Golan Heights as part of Israel.

During the Syrian military’s Northwestern Syria offensive (April 2019–present) against rebel-held territory, the NFL cooperated with Hayat Tahrir al-Sham (HTS) in the battle over Kfar Nabuda in Idlib, May 2019.

The move came after the discovery of a large-scale embezzlement involving the Sham Legion and other groups within the NFL who misrepresented the amount of fighters within their ranks in order to receive extra salaries from their Turkish ally.