On April 22, 2015, a wide rebels coalition called “Army of conquest” (around 40 rebels groups including al-Qaeda linked Al Nusra, Islamic front groups and Free syrian army groups) launched a wide-scale and coordinated attack on a front line ranging from al-Ghab plains in the South West, to Arihah-Mastumah area in the East). The offensive aimed at cutting Loyalists supply road in a first step, and at seizing the whole area in a second step. Eventually, capture of the area by the rebels would open widely the road to Latakia front further West.
Situation on April 22, 2015, before offensive (rebels progress was noted in Al-Mushayr, close to M4 road) :
Situation on April 26, 2015, after 4 days fighting and following capture of Jisr al-Shughur by rebels :
Situation on April 27, 2015, in the East of the corridor after capture of Qarmid camp by Nusra front. Mastumah & Ariha are next targets for rebels coalition.
Loyalists launched a counter-offensive on April 27 2015 on Tanmiyah checkpoint, Ziyarah & Qastun, aimed at opening new supply road to Ariha. On April 28, 2015, government advance was supported by airstrikes on Qastun & Sahan but both towns were still controlled by rebels.
On April 30, 2015, loyalists launched several attacks in Latakia and Northern Hama in order to secure Latakia supply road. They claimed to control Jubb al-Ahmar in the mountains West of Al-Ghab plains (although not confirmed by other sources), and to secure Fawru, thus reopening road to Qarqur and Ariha. In the south-West of Jisr, Ganiyah status remain unclear.
Rebels repelled loyalists attacks near Qastum, and counter-attacked south of power plant, advancing toward Msheek. On May 2, 2015, Jabhat al-Nusra detonated a truck bomb on the West gate of Jisr al-Shughur hospital where estimated 100-150 loyalists soldiers are still resisting. Meanwhile, rebels continued to advance East and south of Ariha, capturing loyalists positions on the hills overlooking the city.
On May 2, 2015, Government offensive continued in Ziyarah and resulted in seizing the town and parts of Tall Waset