Geographically focused on the Euphrates Region were the YPG's partners in the Euphrates Volcano joint operations room, several mainstream Syrian rebel factions of the Free Syrian Army, who had helped defend the Kurdish town of Kobanî during the Siege of Kobanî. Liwa Thuwwar al-Raqqa had been expelled by the al-Nusra Front and ISIL from the city of Raqqa for its alliance with the YPG. The group participated in the capture of Tell Abyad from the Islamic State.