Qalamoun offensive (May–June 2015)

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Qalamoun offensive (May–June 2015)

The Qalamoun offensive was a major battle in the Qalamoun Mountains along the Syria–Lebanon border. It was led by the Syrian government and Hezbollah against Nusra Front and other rebel groups, with ISIL playing a role in the area at times. The goal was to cut rebel supply lines to Damascus and push fighters away from the border.

Who fought
- Government side: Syrian Arab Republic, Hezbollah, Amal Movement, and allied forces
- Rebel side: Nusra Front (al-Qaeda’s branch in Syria), Islamic Front, Army of Conquest, various Free Syrian Army factions, and ISIL (which cooperated with Nusra briefly but clashed with them later)

What happened (simplified timeline)
- 4 May: Fighting began near the Assal al-Ward border crossing.
- Early–mid May: Hezbollah and the Syrian Army captured key hills and border positions; many rebels retreated toward Arsal.
- 11–13 May: Major gains included Tallat Mussa; rebels’ supply lines across the border were weakened.
- 21 May: Government and Hezbollah held most of the Qalamoun mountains on the Syrian side and controlled the border crossings into Lebanon.
- 25 May: Hezbollah and allied forces captured western hills of Tal Thaljah; by the end of May, the government controlled most of the Syrian side of Qalamoun (some reports said about 90%).
- 30 May–3 June: Fighting continued in Flita and surrounding areas as forces pressed toward Arsal.
- 9–16 June: Hezbollah and the Syrian Army pushed deeper, battling Nusra and ISIL pockets; by mid-June, the major rebel positions in the main range were largely cleared, with only small pockets left near the border.

Result
- Pro-government victory: Hezbollah and the Syrian Army regained control of most of the Qalamoun Mountains, seized key border crossings, and pushed rebels toward Arsal. Nusra and ISIL still held some small areas in the far northern and eastern parts, but the rebels lost most of their foothold in the region.

Aftermath
- With the offensive wrapping up, government and Hezbollah redeployed to other fronts, such as Zabadani. The broader conflict continued, and regional ceasefires and negotiations followed in the months afterward.