English: Map of the situation during the Battle of Al-Hasakah (June–August 2015), on July 3, 2015. On June 23, ISIL launched an assault on Al-Hasakah, its largest offensive on the city since September 2014. By late June 2015, ISIL had captured most of southern Al-Hasakah city from the Syrian Army, as well as the villages between the Kurdish-held Abd al-Aziz Mountains and the city, from Abyad to the south of Al-Harmalah. In early July 2015, the Kurdish YPG and the Assyrian Syriac Military Council joined the battle, with the US-led Coalition conducting numerous airstrikes in support of the YPG-led forces. On July 3, ISIL forces had advanced to the Khabur River in southwestern Al-Hasakah city, reaching the joint YPG and Syriac Military Council-controlled portion of Al-Hasakah. By then, ISIL had deployed over 4,500 militants into Al-Hasakah to take the city. By July 9, the YPG and its allies had recaptured most of the villages to the east of the Abd al-Aziz Mountains that the Syrian Army had lost to ISIL, and began severing ISIL's supply routes to Al-Hasakah.

On July 17, the YPG had fully severed all of ISIL's supply routes to the city, besieging 1,200 ISIL militants in the Abu Bakr suburbs of eastern Al-Hasakah, and in the districts of Al-Nashwa, Gweiran, and Al-Zuhour in southern Al-Hasakah city. By then, the Syrian Army had ceded control of the remaining villages it controlled to the west of Al-Hasakah city to the YPG, leaving the Syrian Army in control of only central Al-Hasakah, and parts of southern Al-Hasakah. On July 28, the YPG and the Syrian Army expelled ISIL from most of Al-Hasakah; however, two pockets of ISIL militants continued to linger in the Al-Zuhour District and near the southern entrance to the city. On August 1, the YPG and Syrian Army finished cleanup operations in Al-Hasakah, fully expelling ISIL from the city, and ending the battle. Around 3,200 ISIL militants, 120 Syrian Army soldiers, and dozens of YPG fighters had died in the battle. By the end of the battle, the YPG and the Syriac Military Council were in control of 70% of Al-Hasakah city, while the Syrian Government forces controlled the remaining 30%, nearly the opposite of the previous ratio of control prior to the battle.