Tensions between the two groups initiated on 4 October, when Ahrar al-Sham captured a Jund al-Aqsa member accused of being a cell for the Islamic State of Iraq and the Levant. In response, Jund al-Aqsa militants kidnapped an Ahrar al-Sham member, beat his wife, and shot his brother. Both sides called for the release of their captured members and threatened military action. The conflict escalated on 6 October, as clashes broke out throughout the Idlib Governorate and the northern Hama Governorate. Jund al-Aqsa captured all Ahrar al-Sham positions in the town of Khan Shaykhun and attacked them in northern Hama, while Ahrar al-Sham expelled the former from Maarat al-Nu'man and 4 other villages in Idlib. 800 fighters from Ahrar al-Sham and Jabhat Fateh al-Sham defected to Jund al-Aqsa during the clashes. As a reaction to the clashes, several other rebel groups signed a statement announcing that they would side with Ahrar al-Sham against Jund al-Aqsa in the conflict. The signatory groups were: Jaysh al-Islam, Suqour al-Sham Brigade, Sham Legion, Army of Mujahideen, Fatah Halab, and Fastaqim Union. On 8 October, clashes between the two groups spread to a village in Jabal Zawiya, and a senior military commander of Ahrar al-Sham was killed. The next day, in an attempt to end the conflict and find protection, Jund al-Aqsa pledged its allegiance to the al-Qaeda-affiliated al-Nusra Front. However, clashes continued in Idlib, after Ahrar al-Sham rejected the move and vowed to continue fighting Jund al-Aqsa. Two days later, a ceasefire agreement was signed between Jund al-Aqsa, Ahrar al-Sham, and al-Nusra. However, clashes between the two groups soon erupted again in Idlib. In addition, Jund al-Aqsa, along with al-Nusra, reportedly attacked a base of Ahrar Al-Sham in the town of Tahtaya. Meanwhile, 150 Jund al-Aqsa fighters reportedly defected to ISIL as result of the rebel infighting and their group's pledge to the al-Nusra Front. On 13 October, the general commander of Ahrar al-Sham announced the "end" of Jund al-Aqsa.
Aftermath
On 22 October, Jund al-Aqsa as part of Jabhat Fatah al-Sham attacked Ahrar al-Sham's headquarter in Sarmin. In January 2017, the al-Nusra Front launched several coordinated attacks against Ahrar al-Sham headquarters and positions in the northern Idlib Governorate, near the Bab al-Hawa Border Crossing. In addition, al-Nusra also attacked Ahrar al-Sham outposts in Darkush and Jisr al-Shughur. On 20 January, Jund al-Aqsa raided an Ahrar al-Sham prison in the Zawiya Mountain and freed 13 of their prisoners. Meanwhile, in the same area, al-Nusra attacked the Mountain Hawks Brigade of the Free Idlib Army, and captured a commander and his equipment.
