[7] The Mu'tasim Division has criticised al-Nusra for “attacking rebel factions, stealing weapons of the Mujahideen, cutting roads, seizing headquarters, refusing to respect Shariah practices, and tarnishing the reputation of the sons and leaders of the revolution.”[8] The group's commander, Lieutenant Colonel Muhammad Hassan Khalil, was originally a rebel commander in Jabal al-Akrad, Latakia Governorate.

[7] In April 2016 the group participated in the Northern Aleppo offensive (March–June 2016), along with the Sham Legion and the Sultan Murad Division, driving vehicles from Doudiyan toward ISIL positions in al-Rai and capturing eight villages in the way.

The Mu'tasim Brigade accused Major General Dara Aza, former commander of rebels in Mare', and al-Nusra Front of carrying out the abduction.

[2] On 12 April 2017, 100 new fighters of the Mu'tasim Brigade graduated after they completed training in a camp near Mare', bringing the total number of members in the group to 1,000, according to one of its commanders.

[9] On 12 May 2018, commanders of Jaysh al-Islam and al-Rahman Legion, who frequently fought until they were defeated in eastern Ghouta and transferred to northern Aleppo, met in the Mu'tasim Brigade's headquarters and pledged not to continue fighting each other.