[2] After its formation in 2012 as the "Muthanna bin Haritha Vanquisher of the Persians Battalion" (كتيبة المثنى بن حارثة قاهر الفرس), it expanded to a sizable group.

[3] The movement joined an operation room with other hardline Islamist groups in Daraa on 3 March 2015 which included the al-Nusra Front, Ahrar ash-Sham and Ansar Bayt al-Maqdis.

[5] Although the group is considered close to al-Nusra, there were reports it declared its support for the Islamic State of Iraq and the Levant in March 2015.

[9] In January 2016, it came into conflict with the Southern Front and the Yarmouk Army after it was accused by them of "kidnappings, assassinations and intimidation" and harboring sympathies for the Islamic State of Iraq and the Levant (ISIL).

[10][11] In March 2016, Muthanna and the Pro-ISIL Yarmouk Martyrs Brigade fought against fighters from al-Nusra Front and Ahrar ash-Sham over control of villages near the border with Jordan and the Golan Heights.