Inter-rebel conflict during the Syrian Civil War
|Inter-rebel conflict during the Syrian Civil War|
|Part of the Syrian Civil War|
Jund al-Aqsa (formerly)
|Commanders and leaders|
Abu Mohammad al-Julani
(al-Nusra Front leader)
Abu Muhammed al Ansari †
(al-Nusra Emir of the Idlib province)
| Abu Bakr al-Baghdadi
Abu Ayman al-Iraqi
(Head of military council)
Abu Omar al-Shishani
(ISIL field commander)
Haji Bakr †
(Senior ISIL commander)
Abu Baraa al-Jazairi †
(Emir of Saraqeb)
Abu Dajana †
(Emir of Deir ez-Zor)
Abu Mohammad Al-Massri †
(Emir of Manbij)
Abu Haidara Al-Tounisi †
(eastern Qalamoun leader)
|Casualties and losses|
|2,764+ killed||2,196+ killed|
|605 civilians killed
76 unidentified killed
an additional 1,200 combatants and 150 civilians estimated killed
Total: 5,641–6,991 killed
The inter-rebel conflict during the Syrian Civil War started after fighting erupted between the Syrian opposition groups: the Free Syrian Army (FSA), the Army of Mujahedeen, the Islamic Front, and the Islamic State of Iraq and the Levant. In early January 2014, serious clashes between the groups erupted in the north of the country. Opposition groups near Aleppo attacked militants from the ISIL in two areas, al-Atareb and Andana, which are both strongholds of the fundamentalist Sunni organization. Despite the conflict between ISIL and other rebels, one faction of ISIL has cooperated with the al-Nusra Front and the Green Battalion (a group of Saudi fighters) to combat Hezbollah in the Qalamoun region.
- 1 Background
- 2 Open warfare
- 2.1 Start of the rebel offensive, ISIL counter-offensive, and mutual advances
- 2.2 Al Qaeda breaks links with ISIL and al-Nusra Front joins the fight
- 2.3 Ongoing clashes, ISIL retreats from Idlib and Latakia
- 2.4 ISIL's Deir ez-Zor offensive
- 2.5 East Ghouta clashes
- 2.6 Aleppo Offensive
- 2.7 Kobanî
- 2.8 Battle for Rif Dimashq and Eastern Qalamoun
- 2.9 Southern Syria fighting
- 3 Attempted mediation
- 4 Casualties
- 5 References
Tension between moderate rebels and ISIL had been high since ISIL attacked and captured the FSA-held border town of Azaz in Northern Aleppo and the nearby Bab al-Hawa border crossing with Turkey, which serves as an important supply route for rebel forces; this took place between 18–23 September 2013. The conflict was renewed over Azaz in early October and in late November ISIL captured the border town of Atme from an FSA brigade. On 31 December 2013, the body of doctor Hussein Suleiman was handed over in a prisoner swap between ISIL and rival rebel forces. Suleiman was tortured and died in ISIL custody. The opposition National Coalition and activists accused ISIL of serving the interests of the Syrian government by tarnishing the image of their uprising.
Start of the rebel offensive, ISIL counter-offensive, and mutual advances
On the evening of 2 January 2014, ISIL forces attacked the rebel-held town of Atarib, where they were accused of two recent incidents of killing or kidnapping mainstream rebel commanders. On 3 January, several civilian protests, counting hundreds of people, were organized against ISIL and to commemorate the death of Suleiman across the Aleppo Governorate. In the Idlib village of Kafr Takharim, ISIL opened fire on the protesters. There were no reports of casualties. In response to the attack on the protesters, two newly formed Islamist rebel groups of the FSA attacked ISIL positions in more than half a dozen locations in the governorates of Aleppo and Idlib.
Rebels in Atarib managed to repel the ISIL attack on the town, after which the ISIL fighters were surrounded, resulting in the capture of a Tunisian commander, Abu Saber al-Tunisi. It was unclear if he was summarily executed by the rebels. 42 ISIL fighters were wounded in the fighting in Atarib, while an opposition media activist was killed while covering the clashes. There were unconfirmed reports of rebels arresting ISIL members in various towns and villages in the Aleppo Governorate and the Idlib Governorate. Fighting raged in the Idlib village of Maarrat Misrin, while in the village of Kafr Nabl, rebel forces surrounded an ISIL facility, giving its fighters 24 hours to surrender. Meanwhile, the rebel Islamic Front, which was also engaged in the fighting against ISIL, sent reinforcements to the ISIL-held town of Azaz.
On 4 January, ISIL were reported to be rounding up "suspect activists" in both Saraqeb and Kafr Nabl. In the Harem area, ISIL forces executed 30 captives, including civilians, after their base was surrounded by rebel forces. In Aleppo, fighting raged throughout the province, with rebel forces making advances against ISIL. FSA units were reportedly making progress in Atarib, but ISIL was surrounding the town and shelling it.
ISIL was also on the offensive, attacking rebel positions and ambushing their forces in attacks that left 24 rebels dead. One attack included a car bomb. At this point, ISIL gave a 24-hour ultimatum to rebel forces attacking them, saying that they would withdraw from Aleppo, allowing government forces to enter rebel territory, if they did not stop their attacks. The rebels reiterated an earlier call on ISIL fighters to defect to their side.
On 5 January, rebels captured an ISIL base in Manbij after heavy fighting. Clashes had also erupted in the town of Tabqa, in the Ar-Raqqah Governorate, and fighting spread to the central Hama Governorate, where ISIL killed seven rebel fighters. During the fighting in Manbij, ISIL used car bombs to defend its territory. Meanwhile, ISIL forces retreated from al-Dana and Atme in the Idlib Governorate, and started heading in the direction of Aleppo. Their positions were overrun by the al-Nusra Front and Ahrar ash-Sham groups, in a possible deal to avoid larger confrontations. ISIL also retreated from Darat Izza, while they managed to retain control of Saraqeb and Kafr Zita. ISIL reinforcements were dispatched from Ar-Raqqah to Aleppo. Overall, 66 combatants, including 11 ISIL fighters, were killed during the day.
According to the opposition Sham News Network, by this point, rebels had captured more than 80% of the ISIL-held Idlib countryside and 65% of ISIL territory in Aleppo and its countryside.
By 6 January, rebels had besieged ISIL in its stronghold of Ar-Raqqah. During the fighting, rebels released 50 prisoners from ISIL custody. Among those rescued was a Turkish news photographer who had been kidnapped since December 2013. 10 Syrian Kurdish prisoners also managed to escape. 70 ISIL and 20 rebel fighters had been killed since the rebel attack on Ar-Raqqah started, according to a rebel officer who expected that it would take them at least a week to drive the al-Qaida linked militants out of the city. Meanwhile, ISIL detonated a car bomb by a rebel checkpoint near the town of Darkush, 20 rebel fighters were killed in the suicide attack on the checkpoint. ISIL fighters retreated from Kafr Zita, In Jarablus, a mile and a half from the Turkish-Syrian border, there were conflicting reports with the Islamic Front stating they had overrun the local ISIL headquarters, with the ISIL denying that and insisting that the group was holding fast.
On 7 January, it was confirmed that 34 foreign ISIL and Jund al-Aqsa fighters had been executed in the previous few days by rebels in the Jabal al-Zawiya area. ISIL retreated from al-Mayadeen in Deir ez-Zor Governorate, without any fighting with rebel forces. East of Rastan, in the Homs Governorate, ISIL attacked a rebel headquarters, killing 15 rebel fighters. During the day, it was revealed that during the previous evening, ISIL executed up to 50 prisoners in the Qadi al-Askar district of Aleppo. The dead included media activists, relief workers, and other civilians. According to the opposition SOHR, 42 people were executed, including, 21 rebel fighters and five media activists.
On 8 January, rebels captured the ISIL headquarters in Aleppo city at the Children's hospital in the Qadi Askar district. ISIL forces lost control over opposition-held areas of the city and retreated to Al-Inzarat on the northeastern outskirts of Aleppo. 300 hostages held by the radical jihadists were set free. In Ar-Raqqah, the hospital was abandoned, bodies were lying in the central square and there was no power or water leaving the city "completely paralyzed", according to an opposition activist. At this point, ISIL controlled two key routes out of Raqqa: to the east toward the Iraqi border and also the road north to the Turkish frontier. The head of the al-Nusra Front, Abu Mohammad al-Golani, confirmed that fighting had taken place between his organization and ISIL and called for mediation and an end to the "infighting." Late in the day, ISIL started a counterattack, as it launched car bomb assaults targeting opposition checkpoints. Three attacks took place in Al-Bab, Hreitan, and Jarabulus in the Aleppo Governorate, Observatory director Rami Abdel Rahman told AFP. He said similar overnight attacks took place in the Aleppo Governorate, while one occurred in Mayadin in the eastern Deir ez-Zor Governorate. The attack in Al-Bab killed nine people.
On 9 January, ISIL sent reinforcements from Deir ez-Zor to back its fighters in the Aleppo countryside. According to local residents, ISIL was preparing many suicide attacks in retaliation for the rebel attacks, and that their commanders were wearing explosive belts all the time. Dutch journalist Lex Runderkamp told Dutch news program NOS that the ISIL reinforcement convoy was 1,300 men strong, including ISIL special forces from Iraq. In Ar-Raqqah, the rebels took control of the political intelligence building, which was located 400 meters from the main ISIL headquarters. However, ISIL still controlled the bridges leading into the city, which left people using boats to get into Ar-Raqqah, and later in the evening, ISIL forces seized the Mashlab district and an al-Nusra Front base in the city. Clashes erupted between ISIL and a rebel brigade by the Castillo road, in Aleppo Governorate. The rebels blocked an ISIL supply route between al-Jandoul and Castillo. Meanwhile, Islamist rebel brigades sent reinforcements to the Bab al-Salama border crossing, at Azaz, which is primarily controlled by ISIL. In Idlib province, ISIL opened fire on a demonstration in Kafartkharim and besieged several field clinics, and stormed one of them, searching for rebels injured earlier in the morning during clashes in Atarib.
According to SOHR, local ISIL forces signed a truce with the Islamic Front and several independent Islamist rebel units in Al-Hasakah Governorate. They agreed with the establishment of a single military command center and legal authority for the area.
On 10 January, ISIL managed to push back rebel forces on the eastern approaches to Ar-Raqqah. ISIL forces also killed 20 rebel fighters in fighting in the town of Al-Bab in Aleppo province, and managed to capture wheat silos and mills just outside the town. ISIL commander Abu Omar al-Shishani entered the town with a convoy of 30 vehicles and troops after he lifted the ISIL's siege of Deir-az-Zor airport.
On 11 January, rebels moved a convoy including tanks and technicals to Saraqeb in preparation to push ISIL out. Heavy fighting erupted and it was reported that rebels took over most of the town, and besieged hundreds of ISIL fighters. Earlier in the day, five rebels were killed on the outskirts of Saraqeb when their car hit a bomb. Meanwhile, ISIL forces managed to capture the border town of Tal Abyad, while in Ar-Raqqah ISIL fighters captured a rebel checkpoint and the train station. ISIL fighters also dumped the corpses of dozens of their foes at the village of Jazra, to the west of Ar-Raqqah. Dozens of bodies of ISIL fighters were also reportedly in Ar-Raqqah's hospital. Rebels managed to regain territory lost in previous days in Aleppo province and were defending against ISIL counterattacks. 20 rebels were killed in fighting in the town of Anadan, while 30 rebels were killed in three days of fighting in the village of al-Tiba, northeast of Sekhna.
On 12 January, it was confirmed that rebel forces had captured the eastern part of Saraqeb with the local ISIL commander surrounded with his fighters in the center of the town. Fighting was still continuing in Ar-Raqqah between ISIL and remnants of rebel units, including the Al-Nusra Front, although by this point ISIL had captured much of the city. According to an opposition activist, 95 percent of Ar-Raqqah and its countryside were under ISIL control. ISIL forces had also captured the towns of Hrietan and Basraton in Aleppo province. It was also reported that the bodies of 70 rebels were delivered to Ar-Raqqah's hospital after they were executed by ISIL following their capture of Tal Abyad. Another report put the number of executed prisoners at 100.
On 13 January, it was reported that ISIL had won the battle for of Ar-Raqqah capturing most of the province and the provincial capital. ISIL had also captured Al-Bab and Beza'a, while the rebels were gaining ground in Jarabulus, near the Turkish border. Another mass execution of prisoners was also reported near the village of Kantari, about 80 kilometers north of Ar-Raqqah, when ISIL killed 46 captured fighters of the Ahrar ash-Sham rebel group. 14 rebels were also executed in Homs province
On 14 January, it was reported that rebels captured the villages of Masqan, Kafar Kalbin and Kafra in Aleppo province, while the ISIL has taken full control of Ar-Raqqah city, after the last remaining rebels retreated. Meanwhile, the rebels also captured the prison in Jarablus, releasing 70 prisoners from ISIL custody.
On 15 January, an ISIL car bomb in Jarablus killed 26 people, of which 23 were rebel fighters and three were civilians. Meanwhile, in Saraqeb fighting was continuing and opposition sources reported that the local ISIL commander, a Belgian, was killed. ISIL denied the claim. Between 15 and 17 January, rebels captured Jibreen, Hardntin Kfarrakeshr, Sheikh Ali, Aajel, 46th base, Orum al-Sughra and Reef al-Muhandiseen, while the ISIL retreated from the village of Kafarjoum, which holds the largest ISIL arms depots in all of Syria. ISIL also withdrew from Saraqab, burning their vehicles as they retreated, while at the same time ISIL recaptured Jarabulus.
On 20 January, 2 suicide cars exploded at the Bab Al-Hawa border crossing, 16 people including six rebels were killed. The same day, ISIL forces seized control of the Al-Jarah military airport. In Manbij, a large suicide car explosion killed 20 people, including rebels, women, and children By 23 January, ISIL was in full control of Manbij and completely secured Darkush the following day.
On 27 January, it was reported that ISIL senior Commander Sameer Abid Mohammed al-Halefawi (aka Haji Bakr) was killed by rebels in Tal Rifaat, near Azaz, and at least two other ISIL senior commanders were captured at Hreitan. Four ISIL fighters and three rebels were killed in the fighting. ISIL confirmed the death of top ISIL leader Haji Bakr on 2 February.
On 1 February, ISIL attacked the headquarters of the Liwa al-Tawhid Brigade in Aleppo, killing the brigade commander Adnan Bakour and 15 other rebels at the cost of at least 9 ISIL fighters. The next day, Al-Qaeda distanced itself from ISIL and its actions in Syria.
On 3 February, the Ar-Raqqah Rebels Brigade launched a military operation against ISIL checkpoints and strongholds in Ar-Raqqah. The day before, five ISIL fighters were assassinated in the Ar-Raqqa national hospital.
On 5 February, a local group of Suqour al-Sham brigade in Hama and ISIL signed a truce, It was also reported that The Front of Aleppo Islamic Scholars issued a statement, giving the ISIL fighters in Syria a three-day ultimatum to either return to Iraq or join other armed factions fighting against the Syrian government.
On 8 February, the Al-Nusra Front and allied rebel factions launched an offensive against the ISIL in the Deir ez-Zor Governorate. It was reported that the ISIL emir of Deir al-Zor, Abu Dajana, was killed in the clashes and the rebels also recaptured facilities in the province. At the same time, 13 foreign ISIL fighters defected in Ar-Raqqa. Between 10 and 12 February, ISIL had almost completely withdrawn from the eastern province of Deir ez-Zor, including the city of Deir ez-Zor.
On 23 February, two ISIL suicide bombers killed a number of rebels in Aleppo, including Abu Khaled al-Suri, who was Al-Qaeda's representative in Syria and top-commander in the rebel group Ahrar ash-Sham. Three days later, the Tunisian ISIL deputy Emir for the Ar-Raqqa province and three other fighters were killed by a roadside bomb, while rebels captured the village of Kafrnaya in Aleppo. It was also reported that ISIL released a rebel commander in Ar-Raqqa.
On 28 February, it was reported that ISIL has begun retreating from the following places in Aleppo province towards Ar-Raqqa: Azaz, Menagh military airport, the Mayer region and the villages of Deir Jamal and Kafin. ISIL has regrouped in particular at their strongholds Jarabulus and Manbij. Azaz was captured by rebels after the ISIL withdrawal.
Ongoing clashes, ISIL retreats from Idlib and Latakia
On 3 March, SOHR reported that ISIL was responsible for the kidnapping of the commander of the rebel “United Front for Southern Damascus” in February 2014.
On 11 March, ISIL massacred at least 22 people, including 12 rebels, after they captured the village of Shuyukh near Jarabulus. During this time, ISIL had also captured the town of Karakozak, in Aleppo province near the Turkish border. The next day, the ISIL emir Abu Mouhammad Al-Massri was assassinated by the FSA affiliated Al-Raqqa Revolutionaries Brigade in the Ar-Raqqa's Tal-Dikan area, near the village of Sarreen.
On 14 March, it was reported that ISIL fully retreated from Idlib and Latakia provinces.
On 16 March, according to local sources a number of foreign ISIL fighters defected to Al-Nusra after they killed their commander. The next day, Al-Nusra and the Islamic Front were able to capture the al-Thalja barrier, resulting in the ISIL withdrawal towards Margada town.
On 27 March, ISIL launched an operation against Al-Nusra and allied forces at the al-Jafra oil field and the Koniko gas factory in Reef Deir Izzor. SOHR confirmed that the ISIL took hold of these facilities, but were forced to withdraw after heavy clashes two days later. On 29 March, ISIL captured the town of Markadah, after the rebels retreated to Al-Sor town in the eastern countryside of Der-Ezzor. At least 35 rebels were reportedly killed by the ISIL in the fighting and many rebels were captured. The SOHR confirmed the death of at least seven ISIL fighters.
ISIL's Deir ez-Zor offensive
On 10 April, ISIL launched an offensive against the rebels in Deir ez-Zor Governorate launched a three-pronged assault on rebel positions in and near the border town of Albu Kamal and reportedly took control of parts of the town.
Between 10 and 13 May, ISIL gained control of important parts of Eastern Deir ez-Zor province and districts of Deir ez-Zor city from rival rebel forces. and gained control of at least five villages in the northern countryside of Al-Raqqa province. ISIL also executed the military commander of the Al-Raqqa rebel brigade and his nephew near Ayn Issa in Al-Raqqa province.
On 2 June, ISIL took full control of Al-Besera, while at the same time the rebels counterattacked, reclaiming 16 villages.
On 5 June, ISIL gained control of the entire western countryside of Deir ez-Zor after Al-Nusra forces withdrew following an assault by Chechen and Afghan ISIL fighters. On 8 June, the FSA reportedly assassinated the ISIL emir of Homs. By 10 June, the offensive into Deir ez-Zor had expanded and ISIL had reportedly driven Al-Nusra and aligned militants from nearly all of the province north of the Euphrates.
Since the start of the ISIL offensive in Deir ez-Zor, the pace of defections from the opposition to ISIL had accelerated, most significantly in the town of Al-Muhasan and adjacent villages, where a mass defection by the rebel garrison granted ISIL uncontested control over a key route to the provincial capital.
Between 21 and 22 June, ISIL captured eight towns in the northern part of Aleppo governorate, with the help of American-made Humvees seized in Iraq. Two of the towns were located near the town of Azaz on the border with Turkey.
Between 1 and 3 July, ISIL, bolstered by reinforcements from Iraq, captured Abu Kamal, Mayadin and Shuhail. ISIL also gained control of Syria's largest oil field, al-Omar in Deir ez-Zor province, after Al-Nusra forces fled the facility. By this point, the entirety of the province with the exception of the provincial capital, its airport, and a few villages had fallen to ISIL. Following this, ISIL captured the villages of Quniya and Buqris, close to the town of Mayadin.
On 14 July, ISIL expelled Nusra and other assorted rebel groups from all rebel-controlled neighborhoods in Deir ez-Zor city. By this stage, ISIL controlled between 95% and 98% of Deir Ez-Zor province.
East Ghouta clashes
On 1 July, clashes erupted between Jaysh al-Islam and ISIL in the Eastern Ghouta town of Medaa. ISIL captured 25 of their fighters and executed an unknown number of them. The next day, Jaysh al-Islam reportedly expelled ISIL fighters from the Ghouta town of Maydaa in Damascus province.
One week later, a key commander of Jaysh al-Islam, Abu Mohammad Haroun, was assassinated by ISIL by a roadside bomb in the Ghouta suburbs.
Following the ISIL victory in Deir ez-Zor, it was reported that the entirety of Dawoud Brigade, a thousand strong division of the Jaysh al-Sham defected to ISIL. The defection of Dawud is reported to have bolstered ISIL forces in Raqqa with more than a hundred combat vehicles, at least ten of them tanks.
On 13 August, it was reported that IS seized control of eight villages and several towns in Aleppo province from rebels, including Turkmen Barah and Akhtarin; the fighting reportedly killed 40 rebel fighters and 12 IS members.
By 16 August, IS captured around 10 villages and towns and was advancing towards Marea and Aazaz. Fighting raged near Marea, the main base of Islamic Front rebel group, where rebel reinforcements were being sent. During the day, IS forces captured three villages near Marea. Additionally, by 18 August opposition sources had reported the mass defection of the Aleppo-based Khaled Rashed, Green and Tawhid-e-jihad brigades to the Islamic State.
On 24 August, rebels recaptured the villages of Adeyyi and al Dahreyyi. On 27 August it was reported that rebels had started an offensive called Nahrwan Al-Sham to expel IS from the northern and eastern Aleppo countryside; opposition sources claimed that rebels had regained control of several villages and killed 43 IS fighters.
In the summer of 2014, ISIL began taking over the area south of the Turkish border and then started to besiege the town of Kobanî. The Kurdish People's Protection Units were assisted by the FSA groups Dawn of Freedom Brigades, Liwa Thuwwar al-Raqqa, the Al-Qassas Army and the Jarabulus Brigade during the defense of Kobanî against ISIL.
On 26 January 2015, YPG and rebels recaptured the town of Kobani.
Battle for Rif Dimashq and Eastern Qalamoun
In 2015, most of the fighting between the rebels and ISIL took place in the Rif Dimashq Governorate, while some factions from both parties chose to fight together against the Syrian Army, Lebanese Army and Hezbollah in the border area with Lebanon.
On 26 February 2015, ISIL fighters attacked rebels in the area of Dakwa, in the countryside east of Damascus, and took control of it.
On 13 March 2015, a rebel joint-force consisting of Jaysh Usud al-Sharqiya, Ahmad al-Abdo Martyrs Brigades and Battalions, al-Nusra Front, Jaysh al-Islam and Ahrar ash-Sham launched an offensive against ISIL in the eastern Qalamoun area. They reportedly captured the Bir al-Mahrotha area and killed the ISIL leader Abu Haidara Al-Tounisi that day. Two days later, the rebels captured "wide parts" of the al-Zarka area and the al-Qaryatayn mountains from ISIL.
On 19 March 2015, rebels attacked ISIL positions in al-Kafat area, after an al-Nusra Front suicide attack, and reportedly advanced.
On 1 April 2015, ISIL, reportedly facilitated by Nusra's local wing, stormed Yarmouk refugee camp in the area outlying central Damascus. Quickly taking control of wide swaths of the camp, the militants engaged in drawn out battles with anti-Assad rebel fighters and the Hamas affiliated Aknaf Bait al-Maqdis before a rebel offensive managed to regain some of the camp the next day. However, ISIL militants re-entered the camp the following day and seized up to 90% of it.
On 5 April 2015, rebels announced an offensive against ISIL in the Syrian desert and reportedly captured the Alyaniah mountains. The SOHR reported that seven fighters from both sides were killed in the al-Mahesa area. Three rebels were captured by ISIL as well.
On 12 April, Jaysh al-Islam and allied forces launched a counter-attack on the ISIL-held Hajar al-Aswad district. On 17 April, Jaysh al-Islam and the 1st Brigade also launched an offensive against ISIL in the neighborhoods of al-Qaboun, Jobar and Barzah.
On 22 April, ISIL captured wide parts of al-Mahsa area, in the eastern Qalamoun, and cut off the rebel supply line between Jordanian border and the Syrian al-Badia. According to one report, 30 rebels and at least 12 ISIL militants were killed, while another stated nearly 100 rebels were dead or missing. A pro-opposition source stated ISIL recaptured all areas they lost to the rebels in the previous four months.
Southern Syria fighting
Between 27 and 29 April 2015, fighting raged south of Quneitra city, near the Israeli-held Golan Heights, between an ISIL-linked rebel group (Jihad Units) on one side and al-Nusra and FSA fighters on the other. The clashes started after a pair of ambushes by the Jihad Units of rebel convoys preparing an offensive against government forces. The rebels besieged 200 Jihad Units fighters in a village and took control of wide areas the group controlled. On 29 April, fighting also erupted in Daraa province between al-Nusra and the Yarmouk Martyrs Brigade, which was accused the previous month of also pledging allegiance to ISIL. Yarmouk Martyrs Brigade captured an al-Nusra post in the town of Sahem al-Jolan. On 30 April, rebel forces captured the Quneitra border crossing from the Jihad Units. Overall, the fighting left 31 rebels (25 al-Nusra), 14 Jihad Units fighters and two members of Shohadaa al-Yarmouk dead.
On 19 January, ISIL reached out to other rebel groups in Syria to stop the rebel in-fighting, by posting an audio message online. On 4 April, Al-Qaeda chief Ayman al-Zawahri called on the rival jihadists and rebels to end the infighting, stating that the violence is “sedition”. In early May, Ayman al-Zawahiri again called on ISIL and the Al Nusra Front to stop their fighting. However, fighting continued between the two groups. The Al-Nusra Front issued a statement on 4 May 2014 in which it agreed to stop fighting with ISIL, however, it stated that it will retaliate if ISIL attacks first. In May 2014, ISIL launched an offensive against Al-Nusra and allied groups in Deir ez-Zor Governorate, seizing oil wells and leaving hundreds dead on both sides.
In September 2014, moderate rebels and the Islamic State signed a non-aggression pact in Al-Hajar al-Aswad. However, the report of a truce has been denied by the Islamic Front, the Syria Revolutionaries Front, and other rebel groups.
Between 3 January and 28 June 2014, 5,641–6,991 people had been killed in the inter-rebel fighting, according to the SOHR. By 25 February 2014, ISIL had conducted 34 suicide attacks. On 26 August 2014, the Syrian Network for Human rights reported that since the declaration of the Islamic State on 9 April, 2,691 anti-ISIS rebels and 782 civilians had been killed.
Between 28 June 2014 and 28 April 2015, Islamic State militants executed a total of 2,154 people, with 1,362 being civilians, 529 government soldiers, 137 rebels and 126 Islamic State deserters.
- "Al-Qaeda-linked Isis under attack in northern Syria". BBC. 4 January 2014. Retrieved 10 January 2014.
- "Islamist militias unite under ‘code of honor’". The Daily Star. 19 May 2014. Retrieved 3 March 2015.
- "Syria: al-Nusra Front declares war on ISIS". Al Akhbar English. 26 February 2014. Retrieved 3 March 2014.
- "ÖSO'ya verilen silahlar IŞİD’in eline geçti". Yakın Doğu Haber. 30 June 2014. Retrieved 22 September 2014.
- "US Senate Approves Plans To Arm Syrian Rebels As France Begins Airstrikes In Iraq". Vice News. 19 September 2014. Retrieved 22 September 2014.
- "Jabhat al-Nusra, IS clash in Daraa". Al Monitor. 16 December 2014. Retrieved 20 December 2014.
- "Al-Nusra overtakes Hazm in Aleppo countryside". Al Monitor. 3 March 2015. Retrieved 3 March 2015.
- "34 jihadists dead after rebel clashes in Syria's Idlib: activists". AFP. 7 January 2014. Retrieved 14 September 2014.
- "The Other Syrian Peace Process". Carnegie Endowment for International Peace. 27 January 2014. Retrieved 14 September 2014.
- "Group linked to al-Qaeda regains ground in northeast Syria". Reuters. 12 January 2014. Retrieved 12 January 2014.
- Agencies. "'Islamic State' expels rivals from Syria city". Aljazeera.com. Retrieved 22 October 2014.
- "Three-sided war helps Syrian army regain ground". Al-Monitor. Retrieved 22 October 2014.
- "Syrian rebels push Qaeda affiliate from northwest stronghold". Reuters. Retrieved 22 October 2014.
- Al-Qaeda fighters kill Syrian rebel leaders Al-Jazeera, 2 February 2014
- "Senior Al-Qaeda figure killed by ISIS". The Daily Star. 24 February 2014.
- "Key Al-Qaida Militant Reportedly Killed in Syria". Yahoo. 27 January 2014. Retrieved 23 October 2014.
- "Car bomb blamed on al Qaeda kills 26 in north Syrian town". Reuters. Retrieved 22 October 2014.
- "ثوار القلمون يطردون تنظيم "الدولة" من مناطق جديدة". الدرر الشامية. Retrieved 15 April 2015.
- "النشرة الإلكترونية لجريدة الشروق التونسية - الصفحة الرئيسيّة". Retrieved 15 April 2015.
- "Syria rebels struggle for control over ISIL-held Raqqa". ARA News. 13 May 2014. Retrieved 16 May 2014.
- "The end of the rebel alliance?". Al Jazeera English. 15 September 2013. Retrieved 19 September 2014.
- "Azaz Northern Storm Brigade". Terrorism Research & Analysis Consortium. Retrieved 25 August 2014.
- "Rebels take on ISIS in new Damascus front". The Daily Star. 17 April 2015. Retrieved 24 April 2015.
- "NGO: Syria jihadists kill rebels in bombing". Al Arabiya. 11 January 2014. Retrieved 12 January 2014.
- "Freedom, Human Rights, Rule of Law: The Goals and Guiding Principles of the Islamic Front and Its Allies". Democratic Revolution, Syrian Style. 17 May 2014. Retrieved 19 September 2014.
- "Syria: Army of the Mujahideen Challenges ISIS Gains". Al Akhbar. 6 January 2014. Retrieved 19 September 2014.
- "Jabhat Al-Nusra's Win In Idlib Highlights Al Qaeda's Strategy To Defeat President Bashar Assad". International Business Times. 31 March 2015. Retrieved 2 April 2015.
- "ISIS militants have army of 200,000, claims senior Kurdish leader". http://www.el-balad.com. Retrieved 16 November 2014.
- "Islamic State has 200,000 fighters claims Kurdish leader". 16 November 2014.
- "Thousands were killed and were killed during clashes with the Islamic state". Syriahr.com. Retrieved 22 October 2014.
- "Factbox: Syria's rebel groups". Reuters. 9 January 2014. Retrieved 3 March 2015.
- "Syrian opposition turns on al-Qaida-affiliated Isis jihadists near Aleppo". The Guardian. 3 January 2014. Retrieved 27 February 2014.
- "ISIS joins other rebels to thwart Syria regime push near Lebanon". McClatchy DC. 4 March 2014. Retrieved 1 April 2014.
- "Al-Qaida militants captured town in northern Syria". Associated Press. 19 September 2013. Retrieved 4 January 2014.
- The Islamic Alliance Emerges, understandingwar.org, Sep 27, 2013
- "Syrian rebel factions tell al Qaeda groups to withdraw". 3 October 2013. Retrieved 4 January 2014.
- "ISIL captures Syrian town on border with Turkey". World Bulletin. 22 November 2013. Retrieved 4 January 2014.
- "New Syria rebel alliance declares war on Al Qaida". AFP. 4 January 2014. Retrieved 4 January 2014.
- "Syria rebels fight back against ISIS". The Daily Star. 4 January 2014. Retrieved 7 January 2014.
- "Jihadists kill 31 rebels in Syria: monitor". AFP. 5 January 2014. Retrieved 7 January 2014.
- "Syria rebels unite and launch new revolt, against jihadists". AFP. 4 January 2014. Retrieved 29 April 2014.
- "Across parts of northern Syria, rebels battle al-Qaida-linked insurgents". Associated Press. 5 January 2014. Retrieved 5 January 2014.
- "Syrian rebels push al-Qaeda back". Al Arabiya News. 5 January 2014. Retrieved 5 January 2014.
- "Al Qaida fighters pushed from much of northern Syria, but fighting still rages". McClatchy. 5 January 2014. Retrieved 5 January 2014.
- "137 died yesterday, including 93 of the Islamic state and battalion combat". Syriahr.com. Retrieved 22 October 2014.
- "Al Qaeda-linked group routed in Syrian rebel infighting". Los Angeles Times. 5 January 2014. Retrieved 5 January 2014.
- "Syria rebels lay siege to Qaeda-linked jihadists". AFP. 6 January 2014. Retrieved 6 January 2014.
- "20 fighter spent detonated the car bomb Bdrickosh". Syriahr.com. Retrieved 22 October 2014.
- Al Qaida rebels leave mass grave behind as they desert base in Syria[dead link]
- "Syrian rebel infighting spreads to stronghold in east". Los Angeles Times. 6 January 2014. Retrieved 6 January 2014.
- "34 jihadists dead after rebel clashes in Syria's Idlib: activists". AFP. 6 January 2014. Retrieved 7 January 2014.
- Lundquist, Lisa (2014-01-07). "Today In". The Long War Journal. Retrieved 2014-02-10.
- "Clashes Athalasalamahtantql to Homs and killed 15 fighters in the vicinity of Rastan". Syriahr.com. Retrieved 22 October 2014.
- "Al-Qaeda group kills Aleppo prisoners: report". Al Jazeera English. 7 January 2014. Retrieved 10 January 2014.
- "Syria rebels seize al-Qaida base in north". Associated Press. 8 January 2014. Retrieved 8 January 2014.
- "Aleppo free of ISIL control, rebel commander says". NOW News. 8 January 2014. Retrieved 8 January 2014.
- "As Rebels Fight Rebels, Grim Reports From A Syrian City". NPR. 8 January 2014. Retrieved 9 January 2014.
- "Al-Qaeda’s ISIL vows to ‘crush’ Syrian rebels". Zaman Alwsl. 8 January 2014. Retrieved 10 January 2014.
- "Jihadists battle back in north Syria, says monitor". AFP. 9 January 2014. Retrieved 9 January 2014.
- "ISIS send 1300 men towards Aleppo". NOS. 9 January 2014.
- "Jihadists advance on Syria's Raqqa". NOW. 10 January 2014. Retrieved 10 January 2014.
- "Clashes in Aleppo province on 9 January". SOHR. 9 January 2014.
- "Idlib countryside on 9 January". SOHR. 9 January 2014.
- "Jihadists try to mount rally in eastern Syria to retake territory". dailystar. 10 January 2014. Retrieved 10 January 2014.
- "Al Qaeda group fights back against Syria rebel assault". Reuters. 10 January 2014. Retrieved 10 January 2014.
- "500 Reported Killed In Rebel Infighting In Syria". Associated Press. 11 January 2014. Retrieved 11 January 2014.
- "protest march in Aleppo, 10 January 2014". Reuters. 10 January 2014. Retrieved 10 January 2014.
- "Rebels clash in north Syria, bodies pile up in hospital - monitors". Reuters. 11 January 2014. Retrieved 11 January 2014.
- "NGO: Syria jihadists kill rebels in bombing". Alarabiya. 11 January 2014. Retrieved 11 January 2014.
- "Syrian troops advance on Aleppo area: activists". AFP. 11 January 2014. Retrieved 11 January 2014.
- "Rage grows against both ISIL and rebel leaders". The Daily Star. 11 January 2014. Retrieved 11 January 2014.
- "294 died yesterday, including 210 combat battalions of regular troops and". Syriahr.com. Retrieved 22 October 2014.
- "Syrian opposition and ISIS continue Idlib battle". Asharq Al-Awsat. 12 January 2014. Retrieved 3 March 2015.
- "Syria conflict: 700 killed in eight days in early January, Syrian Observatory for Human Rights says". ABC. 12 January 2014. Retrieved 12 January 2014.
- "Al Qaeda Syria unit executes dozens of rivals in Raqqa: activists". Reuters. 12 January 2014. Retrieved 13 January 2014.
- "Syria, anti-Assad rebel infighting leaves 700 dead, including civilians". AsiaNews. 13 January 2014. Retrieved 13 January 2014.
- "Al-Qaida-Linked Group Ousts Rivals From Syria Town". Associated Press. 13 January 2014. Retrieved 13 January 2014.
- "ISIS jihadists seize 'most' of north Syria town: activists". The Daily Star. 13 January 2014. Retrieved 13 January 2014.
- "Jihadists seize Syria town, 'execute 60'". AAP. 14 January 2014. Retrieved 13 January 2014.
- "Opposition forces seize Masqan in Aleppo as ISIL tightens grip over Al-Bab". Syria Newsdesk. 14 January 2014. Retrieved 17 January 2014.
- "ISIL recaptures Raqqa from Syria’s rebels". Aljazeera.com. Retrieved 22 October 2014.
- "Rebel factions oust ISIL from most of Jarablos in Aleppo". Syria Newsdesk. 14 January 2014. Retrieved 17 January 2014.
- "Phalange fighter captures the villages and Jibreen Hardntin Brive Aleppo". Syriahr.com. Retrieved 22 October 2014.
- "Combat battalions controlled Alr another village Brive Aleppo". Syriahr.com. Retrieved 22 October 2014.
- "Al-Mujahideen Army ousts ISIL from Ratyan in Aleppo". Syria Newsdesk. 18 January 2014. Retrieved 18 January 2014.
- "Syrie: 16 morts dans un double attentat". Lefigaro.fr. 2014-01-20. Retrieved 2014-02-10.
- "3 suicide car explosions in Aleppo and Idlib". Syriahr.com. 2014-01-20. Retrieved 2014-02-10.
- "Zawahri urges end to deadly clashes between rebels and jihadists". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- "ISIS have completely taken over the town of Darkoush". Syriahr.com. Retrieved 22 October 2014.
- "ISIS leaders killed, captured in Aleppo". The Daily Star. 28 January 2014. Retrieved 28 January 2014.
- "ISIS confirms death of senior leader in Syria". The Long War Journal. 5 February 2014.
- "ISIS Attacks Rebel Base in Aleppo". Syrian National Coalition Of Syrian Revolution and Opposition Forces. 1 February 2014.
- "Al-Qaeda disavows ISIS militants in Syria". BBC News. 3 February 2014.
- "Al-Raqqa rebel group promises military action against ISIL". Syria Newsdesk. 4 February 2014.
- "FSA attacks ISIL checkpoint in Al-Raqqa". Syria Newsdesk. 3 February 2014.
- "No truce with ISIS, Islamist group says". The Daily Star. 7 February 2014.
- "The Front of Aleppo Islamic Scholars urges ISIL to depart Syria immediately". Syria Newsdesk. 5 February 2014.
- "Activists say ISIS top commander killed in Syria". Al Arabiya News. 8 February 2014.
- "13 members defect from ISIL in Al-Raqqa". Syria Newsdesk. 9 February 2014.
- "Sectarian Massacre In Hama, ISIS Withdraws From Deir Al-Zor". The Syrian Observer. 12 February 2014.
- "Regime forces inch closer to Aleppo". The Daily Star. 26 February 2014.
- "ISIS jihadists retreat from parts of north Syria:activists". The Daily Star. 28 February 2014.
- "Regime captures village near Yabroud". The Daily Star. 4 March 2014.
- "Jihadists 'execute' at least 22 in Syria: NGO". The Daily Star. 11 March 2014.
- "'Shoot' order given to Turkish troops based in Aleppo". World Bulletin. Retrieved 22 October 2014.
- "FSA assassinates ISIL leader in Al-Raqqa countryside". Syria Newsdesk. 12 March 2014.
- "ISIL fighters pull out of key Syrian Turkmen town". World Bulletin. Retrieved 22 October 2014.
- "Clashes renewed between Islamist groups near Syria's Hasaka". ARA News. 18 March 2014. Retrieved 9 November 2014.
- Clashes in Der-Ezzor and Bombardment on areas in Hama[dead link]
- "Syrians rally in support of rebels’ coastal offensive". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- "ISIS kills 35 fighters from Jabhat Al-Nusra and Islamic battalions". Syriahr.com. Retrieved 22 October 2014.
- "Syria Qaeda loses ground to jihadist rivals on Iraq border". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- "Al Qaeda splinter group moves to take eastern Syrian city". Reuters. Retrieved 22 October 2014.
- "Al Raqqa Province: ISIS executed the... - Syrian Observatory for Human Rights - Facebook". Facebook.com. Retrieved 22 October 2014.
- "المرصد السورى لحقوق الإنسان - المرصد السورى لحقوق الإنسان". المرصد السورى لحقوق الإنسان.
- "Jihadists trying to establish Islamic state on border of Syria and Iraq". Haaretz.com. 21 May 2014. Retrieved 22 October 2014.
- "Der Ezzor Province: ISIS has taken... - Syrian Observatory for Human Rights - Facebook". Facebook.com. Retrieved 22 October 2014.
- "Der-Ezzor province: ISIS took control on... - Syrian Observatory for Human Rights - Facebook". Facebook.com. Retrieved 22 October 2014.
- "ISIS bolsters presence in eastern Syria, advances towards Iraq". Aawsat.net. Retrieved 22 October 2014.
- "الجيش الحر يغتال أمير داعش في حمص والمنطقة الشرقية". Akhbar.alaan.tv. Retrieved 22 October 2014.
- "Al-Qaida offshoot in fierce offensive, carves out territory across Syria and Iraq". Reuters. 10 June 2014. Retrieved 10 June 2014.
- Associated Press (20 June 2014). "ISIS seizes Syrian town near Iraqi border after Western-backed rebels defect to jihadi group". National Post. Retrieved 22 October 2014.
- "ISIS’s victories may win it Syrian recruits". Mercedsunstar.com. Retrieved 22 October 2014.
- "Syria jihadists now using Humvees seized in Iraq: NGO". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- Report: Jihadi group captures Syrian border town The Washington Post 2014-07-01
- "Al Qaeda leaves east Syria strongholds to Islamic State: monitor". Reuters. Retrieved 22 October 2014.
- ABC News. "Extremist Group Takes Syrian Towns, Key Oil Field". ABC News. Retrieved 22 October 2014.
- Al Qaeda leaves east Syria strongholds to Islamic State -monitor Reuters Thu Jul 3, 2014
- Islamic State extends gains in parts of Syria: monitor Reuters July 4, 2014
- "Islamic State expels rivals from Syria's Deir al-Zor - activists". Af.reuters.com. Retrieved 22 October 2014.
- "Rebels demand help as fighting rages against ISIS in Ghouta". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- "Reinforcements rush to Aleppo as battles rage". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- "1,000 Syrian rebels defect to Islamic State in sign it’s still strengthening". McClatchy News Service. 8 July 2014. Retrieved 25 August 2014.
- "Rebel-jihadist clashes in north Syria kill 39". The Daily Star Newspaper - Lebanon. Retrieved 22 October 2014.
- "Islamic State seizes more territory in Syria: monitor". Reuters. Retrieved 22 October 2014.
- "52 dead as jihadists make gains in northern Syria: monitor". Yahoo News. 14 August 2014. Retrieved 22 October 2014.
- "Syria Clashes as Jihadists Advance on Rebel Bastions". Naharnet. Retrieved 22 October 2014.
- Allen McDuffee. "ISIL Captures More Syrian Villages En Route to Rebel Stronghold". The Wire. Retrieved 22 October 2014.
- "IS, government forces close in on Aleppo as splits emerge in opposition". Middle East Eye. Retrieved 22 October 2014.
- "Aleppo province:24-08-2014". Facebook.com. Retrieved 22 October 2014.
- "المعارضة تطلق معركة لطرد "تنظيم الدولة"من حلب". Aljazeera.net. Retrieved 22 October 2014.
- "Syria rebels attack IS militants in Aleppo, killing 43". ARA News. Retrieved 22 October 2014.
- "22 killed in protests against ISIL siege of Kurdish tow". Today's Zaman. 8 October 2014. Retrieved 10 October 2014.
- "The Dawn of Freedom Brigades: Analysis and Interview". Syria Comment. 2 October 2014. Retrieved 10 October 2014.
- "FSA fighting alongside Kobane Kurds". NOW. 9 October 2014. Retrieved 10 October 2014.
- "The Factions of Kobani (Ayn al-Arab)". Syria Comment. 21 November 2014. Retrieved 25 November 2014.
- YPG retakes the entire city of Ayn al- Arab “Kobani” after 112 days of clashes with IS militants
- ""Islamic State" attacks Damascus Countryside". Syrian Observatory for Human Rights. 26 February 2015. Retrieved 26 February 2015.
- Master. "Advances for rebels in Qalamoun and losses in Dar’a". Syrian Observatory For Human Rights. Retrieved 15 April 2015.
- Master. "10 killed in Homs, and Clashes continue between rebels and IS in Hama". Syrian Observatory For Human Rights. Retrieved 15 April 2015.
- "Islamic State takes 90 percent of Damascus refugee camp: monitor". Reuters. Retrieved 15 April 2015.
- "Thomas van Linge on Twitter". Twitter. Retrieved 15 April 2015.
- "Army of Islam on Twitter". Twitter. Retrieved 15 April 2015.
- Master. "Rebels clash with regime forces and IS in Reef Dimashq". Syrian Observatory For Human Rights. Retrieved 15 April 2015.
- "Syrian Rebellion Obs on Twitter". Twitter. Retrieved 19 April 2015.
- 42 fighters killed in Qalamoun
- IS cuts off key rebel supply route from Jordan to the Damascus countryside
- Syrian Rebellion Obs on Twitter
- Syrian rebels battle Islamic militants near Golan Heights
- At least 38 militants were killed in Sahem al-Jolan and Quneitra countryside
- Shohadaa al- Yarmouk Brigade seizes a post of Jabhat al- Nusra in Sahem al- Jolan
- Rebels seize southern Syria crossing
- Ahrar al- Sham and other Islamic factions seize the border crossing of al- Quneitera
- Warplanes attack IS positions in al- Hasakah, and calm prevails in the town of Sahem al- Golan
- "ISIL ‘reaching out’ to Syrian rebels, urges end to infighting". Alarabiya. 19 January 2014. Retrieved 19 January 2014.
- "Rebels take northern town on main highway". AFP. 5 April 2014. Retrieved 5 May 2014.
- "63 dead as jihadist rivals clash in east Syria: NGO". AFP. 5 May 2014. Retrieved 5 May 2014.
- "Syria: Al-Nusra Front agrees to end fighting with ISIS". Asharq Al-Awsat. 5 May 2014. Retrieved 21 May 2014.
- "Hundreds killed as ISIL insurgents gain ground in east Syria". Reuters. 10 June 2014. Retrieved 17 June 2014.
- "Syria rebels, ISIS in 'non-aggression' pact near Damascus". The Daily Star. 12 September 2014. Retrieved 12 September 2014.
- "Syrian Opposition Blasts Reports It Signed a Truce With ISIS". The Daily Beast. 16 September 2014. Retrieved 16 September 2014.
- "3,300 have been killed since the start of the clashes with the Islamic State". Syriahr.com. Retrieved 22 October 2014.
- "Total number of victims killed by the Islamic State" (PDF). Sn4hr.org. Retrieved 22 October 2014.
- "Islamic State executes 2154 people since the declaration of its alleged “Caliphate”". SOHR. Retrieved 28 April 2015.