[17] In late 2013, the rebel group co-signed a joint statement calling for Sharia law and rejecting the authority of the Syrian National Coalition.

[34] By March 2013, the al-Tawhid Brigade had become active in northeastern and eastern Syria as well, where one of its representatives, Sheikh Saif, tried to set up a loose coalition of Islamist groups known as the "Islamic Front".

"[28] Researcher Charles R. Lister described the initial al-Tawhid Brigade as "a coalition of local Aleppo-based Islamist units",[31] following an ideology similar to the one of the Muslim Brotherhood.

They thereby implicitly rejected an earlier statement they had made, with other local factions, which had called for an Islamic state in Syria and denouncing the Syrian National Coalition.

[42] In the next month, the al-Tawhid Brigade, Ahrar al-Sham, and the al-Nusra Front launched an offensive which ended in the conquest of the Aleppo suburb of Sheikh Saeed.

[43] In May 2013, the hell cannon, a mortar-like improvised firearm designed and built by the insurgent group Free North Brigade, was first noted in the press.

[45][46] In August 2013, the al-Tawhid Brigade alongside various Islamist rebel groups captured the town of Khanasir, severing the supply routes of the remaining Syrian government loyalists north of Aleppo.

[49] On 24 September 2013, the Tawhid Brigade co-signed a statement with 11 other rebel groups which called for Sharia law and, allying with al-Qaeda, rejected the authority of the Syrian National Coalition.

[51] Following the death of Saleh, the Tawhid Brigade reportedly suffered serious internal divisions and lost considerable members in defections to other rebel factions.

[52][53] On 10 September 2014, the Tawhid Brigade's eastern branch became a founding member group of the Euphrates Volcano operations room based in Kobanî.

[56] However, in October 2016, 4 "battalions" of rebels in Aleppo using the flag of the al-Tawhid Brigade left the Levant Front and joined the Nour al-Din al-Zenki Movement.