Although U.S. Intelligence reports repeatedly stressed that the opposition was incapable of launching a major, well coordinated attack, the Syrian Army in Damascus was confronted with an organized fighting force of 25.000 men under arms.
The Saudi Arabia backed Jihadist front had amassed 25.000 fighters, organized in 13 battalions or kitab, to to launch a major assault against the capital Damascus. Most of the battalions belonged to Jabhat al-Nusrah and Liwa-al-Islam. The other battalions that took part in the campaign, were the Abou Zhar al-Ghaffari, al-Ansar, al-Mohajereen, Daraa al-Sham, Harun al-Rashid, Issa bin Mariam, Sultan Mohammad al-Fatih, Syouf al-Haqq, the Glory of the Caliphate, the Jobar Martyrs.
During the night of 20 to 21 August and during the early morning hours of 21 August, the Syrian Arab Army broke through the insurgent lines in the area near the Jobar entrance. The breakthrough resulted in a collapse of the jihadists defensive positions and to a crushing and decisive strategic defeat of the Jabhat al-Nusrah led brigades.