Al-Hasakah city offensive (May–June 2015)

The Al-Hasakah city offensive (May–June 2015) was launched during the Syrian Civil War by the Islamic State of Iraq and the Levant (ISIL or ISIS) against the city of Al-Hasakah, which was held by both the Syrian Armed Forces and the Kurdish YPG.

Background
In May 2015, the Kurdish YPG, backed by the Assyrian Syriac Military Council, allied Arab tribal fighters, and Free Syrian Army fighters, launched a large-scale offensive in the western Al-Hasakah Governorate, capturing over 4,000 km² of land and over 230 villages from ISIL.

The offensive
On 30 May, ISIL launched an offensive towards the Syrian government-controlled part of Al-Hasakah, and advanced in the city's outskirts after two suicide bombers targeted Syrian Army positions, killing and wounding 50 soldiers. The offensive originated from the ISIL-held town of Al-Shaddadah, south of Al-Hasakah, and was the jihadist organizations's third assault on the city in 2015.

On 31 May, the Syrian Arab Air Force bombed Al-Shaddadah, killing 43 ISIL militants and family members, as well as 22 civilians. The strikes targeted a souq market. The same day, two ISIL suicide bombers attacked military positions near Al-Hasakah. One of them drove a tanker, killing nine soldiers.

On 1 June, ISIL launched its second attack on Al-Hasakah by firing a barrage of mortar shells and rockets toward the city center, followed by a ground assault on the villages of Al-Dawoudiyah and Rad Shaqra. Eventually, the militants breached Syrian Army fortifications at the Al-Ahdath Central Prison, near Al-Dawoudiyah, capturing the southeastern sector of the facility. After Syrian government reinforcements arrived, the Syrian Army was reportedly able to recapture areas of the prison.

On the morning of 2 June, ISIL took control of the southern perimeter of Al-Dawoudiyah. Meanwhile, Syrian government forces reportedly expelled ISIL fighters from Rad Shaqra. The next day, it was reported a newly-formed pro-Syrian government Assyrian militia, called the Gozarto Protection Forces, had arrived from Al-Qamishli to reinforce Syrian government troops.

On 4 June, the Syrian government sent more reinforcements to Al-Hasakah. By this point, ISIL was in control of the Panorama checkpoint, al-Ahdath prison, three villages, including Al-Dawoudiyah, and the city’s electricity company, bringing the jihadists within less than 500 meters of Al-Hasakah. The advances came after an ISIL assault using six suicide bombers, including five against the prison. A total of 11 suicide bombers hit Syrian government positions since the start of the offensive.

On 5 June, the Kurdish YPG and Syriac SMC militias joined Syrian government troops at their security center on Mount Kawkab, in an attempt to prevent any possible ISIL attacks on the city. The next day, ISIL used howitzer artillery against Syrian Army positions near Mount Kawkab.

On 6 June, Syrian government forces launched a counterattack and recaptured the Panorama checkpoint, the prison, and the Al-Hasakah Power Plant. That night, after not getting involved since the start of the offensive, the YPG started fighting ISIL, on the western outskirts of the northern part of the city that they control. Kurdish involvement began after they were criticised by city figures for not defending Al-Hasakah, and were subsequently recognised as "a primary combat force in the city" after several meetings. By the next day, the Syrian Army had recaptured Al-Dawoudiyah and Abyad. Soon afterwards, the Syrian Army repelled a new ISIL attack on the prison and power plant that lasted most of the morning and into the afternoon. Later, the Syrian Army continued its counterattack, and recaptured the villages of Al-Watwatiyah and Al-Mishtal Al-Zura’yy, pushing ISIL back up to 2 kilometers from the city. Clashes continued near the prison and the electricity company, as the Syrian Arab Air Force bombed ISIL positions along the Al-Hasakah-Al-Shaddadah road, and in Al-Shaddadah itself.

On 8 June, the Syrian Army continued its counterattack and reportedly recaptured the village of Aliyah, thus creating a 12 kilometer buffer zone around Al-Hasakah city. The same day, the Syrian Army was declared "triumphant" in their defense of the city by the pro-Syrian government Al-Masdar News.

Aftermath
On 23 June, ISIL began a new offensive on Syrian government-held parts of the city, seizing southwestern neighborhoods after former pro-Syrian government National Defence Force militias in the area allegedly switched allegiance to ISIL. The assault was one of many attacks carried out by ISIL during Ramadan of 2015.