During the Syrian Civil War, al-Hasan has served and commanded his troops during several major engagements, including Operation Canopus Star and the battle for the Shaer gas field.

[8] Al-Hasan was described by analysts as preferring Russia (as opposed to Iran) to serve as the Syrian Government's main ally during the civil war and subsequent post-war reconstruction.

He was quickly inducted into the Air Force Intelligence Directorate’s Special Operations Unit, where he would oversee the training and development of Syria's paratrooper contingents of the Syrian Arab Army (SAA).

Known to be relentless and prudent, Colonel Hassan infiltrated Al-Qaeda networks inside Syria, resulting in the arrest of a number of its members operating within the borders of the country.

In 2011, Colonel al-Hasan was transferred to the SAA's Special Forces (Qawat Al-Khassa), leading the front against Al-Qaeda in Syria—the Al-Nusra Front—on the outskirts of Latakia in 2013.

Colonel Hassan handpicked many of the soldiers that would later form the Tiger Forces; this included his close confidant and companion, Captain Lu’ayy Al-Sleitan.

The battle lasted 10 days, and the Syrian army, backed up by heavy airstrikes, managed to retake control of the town, expelling the rebels.

[21][22][23] On 26 August 2013, rebels captured the strategic town of Khanasir, cutting the government's last land supply route, passing through the desert, to the contested city of Aleppo.

[28] After, solidifying control around Aleppo airport by taking Base 80 and Naqqarin at the end of 2013, al-Hassan and his troops pushed north toward the industrial city.

[29][30] On 22 May 2014, the Syrian troops led by al-Hassan, managed to relieve the Aleppo central prison, which was besieged and attacked relentlessly by rebels and jihadists for more than one year.

[31][32] Opposition forces claim that when they attempted to negotiate the return of Iranian-sponsored Afghan fighters that were captured during the battle, Hassan responded "Do what you want with them.

The situation was difficult for the Syrian army [34] and colonel al-Hassan was assigned the task of leading all the military operations in the governorate to counter the al-Nusra threat.

[37] In early November 2014, he took part in the operation to retake the gas field seized at the end of the previous month by the jihadists of the Islamic State.

[39] Col. Jemiel Radoon of the Falcons of al-Ghab, a Free Syrian Army battalion that made attempts to block Hassan's retreat from Idlib, stated regarding the video: “I know him.