Foreign fighters have fought on all four sides of the Syrian Civil War, as well both sides of the War in Iraq. In addition to Sunni foreign fighters, Shia fighters from several countries have joined pro-government militias in Syria, leftist militants have joined Kurdish forces, and other foreign fighters have joined jihadist organizations and private military contractors recruit globally. Estimates of the total number of foreign Sunnis who have fought for the Syrian rebels over the course of the conflict range from 5,000 to over 10,000, while foreign Shia fighters numbered around 10,000 or less in 2013 rising to between 15,000 and 25,000 in 2017.
Following the outbreak of the protests of Syrian revolution during the Arab Spring in 2011 and the escalation of the ensuing conflict into a full-scale civil war by mid-2012, the Syrian Civil War became a theatre of proxy warfare between various regional powers such as Turkey and Iran. Spillover of the Syrian civil war into the wider region began when the Iraqi insurgent group known as the Islamic State of Iraq (ISI) started intervening in the conflict in 2012.
Many states began to intervene against the Islamic State, in both the Syrian civil war and the War in Iraq (2013–2017), in response to its rapid territorial gains from its 2014 Northern Iraq offensives, universally condemned executions, human rights abuses and the fear of further spillovers of the Syrian Civil War. These efforts are called the war against the Islamic State (ISIS) or the international military intervention against Islamic State (ISIS). In later years, there were also minor interventions by some states against IS-affiliated groups in Nigeria and Libya. All these efforts significantly degraded the Islamic State's capabilities by around 2019–2020. While moderate fighting continues in Syria, as of 2024, ISIS has been contained to a manageably small area and force capability.
On 22 September 2014, the United States officially intervened in the Syrian civil war with the stated aim of fighting the terrorist organization ISIS in support of the international war against it, code named Operation Inherent Resolve. The US currently continues to support the Syrian Free Army opposition faction and the Kurdish-led Syrian Democratic Forces opposed to both the Islamic State and Syrian president Bashar al-Assad.
Operation Shader is the operational code name given to the contribution of the United Kingdom in the ongoing military intervention against the Islamic State of Iraq and the Levant. The operation involves the British Army providing ground support and training to allied forces fighting against ISIL, the Royal Air Force providing humanitarian aid airdrops, reconnaissance and airstrikes, and the Royal Navy providing reconnaissance and airstrikes from the UK Carrier Strike group and escort to allied carrier battle groups.
The Military of the Islamic State is the fighting force of the Islamic State (IS). The total force size at its peak was estimated from tens of thousands to over 200,000. IS's armed forces grew quickly during its territorial expansion in 2014. The IS military, including groups incorporated into it in 2014, openly operates and controls territory in multiple cities in Libya and Nigeria. In October 2016, it conquered the city of Qandala in Puntland, Somalia. It conquered much of eastern Syria and western Iraq in 2014, territory it lost finally only in 2019. It also has had border clashes with and made incursions into Lebanon, Iran, and Jordan. IS-linked groups operate in Algeria, Pakistan, the Philippines, and in West Africa. In January 2015, IS was also confirmed to have a military presence in Afghanistan and in Yemen.
In October 2014, the self-declared Islamic State of Iraq and the Levant (ISIL) took control of numerous government buildings, security vehicles and local landmarks in the Eastern Libyan coastal city of Derna. Although some media outlets reported the control as being absolute, rival groups like the al-Qaeda-affiliated Abu Salim Martyrs Brigade continued to control parts of the city. Clashes erupted between ISIL and an alliance of Islamist groups in June 2015, with ISIL retreating from Derna to outlying suburbs the following month. However, clashes continued between the Islamist alliance and the Tobruk-based government forces.
Executions by ISIS refers here to killing by beheading, immolation, shooting, or other means of soldiers and civilians by the Islamic State of Iraq and the Levant (ISIL). ISIL has released a number of propaganda/publicity videos of beheadings or shootings of captives. Houtat Sulūk is reported to be a mass grave.
The Battle of Sirte refers to the battle in the spring of 2015, in the region of Sirte, Libya, between the Islamic State of Iraq and the Levant (ISIL) and the Libya Shield Force. ISIL forces had been present in the city since February 2015, before the Fall of Nofaliya. After Nofaliya fell to ISIL forces, the Tripoli-based government had decided to send reinforcements to recapture Sirte.
The Islamic State – Libya Province is a militant Islamist group active in Libya under three branches: Fezzan Province in the desert south, Cyrenaica Province in the east, and Tripolitania Province in the west around Tripoli, Libya's capital city. The branches were formed on 13 November 2014, following pledges of allegiance to IS leader Abu Bakr al-Baghdadi by militants in Libya.
On 26 June 2015, attacks occurred in France, Kuwait, and Tunisia, one day following a deadly massacre in Syria. The day of the attacks was dubbed "Bloody Friday" by Anglophone media and "Black Friday" among Francophone media in Europe and North Africa.
In early 2014, the jihadist group Islamic State of Iraq and the Levant captured extensive territory in Western Iraq in the Anbar campaign, while counter-offensives against it were mounted in Syria. Raqqa in Syria became its headquarters. The Wall Street Journal estimated that eight million people lived under its control in the two countries.
This article contains a timeline of events from January 2015 to December 2015 related to the Islamic State of Iraq and the Levant (ISIL/ISIS). This article contains information about events committed by or on behalf of the Islamic State, as well as events performed by groups who oppose them.
Collaboration with the Islamic State refers to the cooperation and assistance given by governments, non-state actors, and private individuals to the Islamic State (IS) during the Syrian Civil War, Iraqi Civil War, and Libyan Civil War.
From November 2015 to 2019, the United States and allies carried out a large series of both airstrikes and drone strikes to intervene in Libya in its revived conflict in support of the Tripoli-based Government of National Accord against the ISIL presence in the region. By 2019, the ISIL branch had been largely driven from holding Libyan territory, and US strikes ceased.
Opposition–ISIL conflict during the Syrian Civil War started after fighting erupted between Syrian opposition groups and the Islamic State of Iraq and the Levant (ISIL). In early January 2014, serious clashes between the groups erupted in the north of the country. Opposition groups near Aleppo attacked ISIL in two areas, Atarib and Anadan, which were 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 to combat Hezbollah in the Battle of Qalamoun. By 2018.
The origins of the Islamic State group can be traced back to three main organizations. Earliest of these was the "Jamāʻat al-Tawḥīd wa-al-Jihād" organization, founded by the Jihadist leader Abu Mus'ab al-Zarqawi in Jordan in 1999. The other two predecessor organizations emerged during the Iraqi insurgency against the U.S. occupation forces. These included the "Jaish al-Ta'ifa al-Mansurah" group founded by Abu Omar al-Baghdadi in 2004 and the "Jaysh Ahl al-Sunnah wa’l-Jama’ah" group founded by Abu Bakr al-Baghdadi and his associates in the same year.
The U.S. intervention in the Syrian civil war is the United States-led support of Syrian opposition and Rojava during the course of the Syrian civil war and active military involvement led by the United States and its allies — the militaries of the United Kingdom, France, Jordan, Turkey, Canada, Australia and more — against the Islamic State of Iraq and the Levant (ISIL) and al-Nusra Front since 2014. Since early 2017, the U.S. and other Coalition partners have also targeted the Syrian government and its allies via airstrikes and aircraft shoot-downs.
Foreign fighters in the Syrian civil war have come to Syria and joined all four sides in the war. In addition to Sunni foreign fighters arriving to defend the Islamic State of Iraq and the Levant or join the Syrian rebels, Shia fighters from several countries have joined pro-government militias in Syria, and leftists have become foreign fighters in the Syrian Democratic Forces.
Islamic State of Iraq and the Levant (Since 2014)
Ansar al-Sharia in Tunisia 
Green Battalion 
Al-Nusra Front (Until 2014)
Syria 
Iraq 
Libya 
EU 
Hezbollah 
Free Syrian Army 
Islamic Front