How a localized insurgency transformed into a full-scale war for the future of Iraq
Between 2013 and 2017, Iraq faced an existential threat from the Islamic State, which seized vast territories and millions of citizens. The conflict drew in a global coalition, reshaped regional borders, and forced a reckoning with deep-seated sectarian divisions, ultimately ending in a fragile victory that left a lingering insurgency.
The conflict escalated from a localized insurgency into a full-scale war by June 2014, when the Islamic State captured major cities including Mosul and Tikrit. At its peak, the group controlled 56,000 square kilometers of territory, governing 4.5 million people. This rapid expansion forced the resignation of Prime Minister Nouri al-Maliki and triggered a massive international response. A U.S.-led coalition provided air support, training for nearly 200,000 Iraqi security personnel, and a $3.5 billion rearmament program, while Iran and Russia also contributed military and logistical aid to the Iraqi government.
The war was marked by extreme violence, including the 2014 execution of 1,700 Iraqi Air Force cadets and the systematic destruction of cultural heritage sites like the tomb of Jonah. The humanitarian toll was catastrophic, particularly for the Yazidi minority, who faced genocide and displacement in the Sinjar region. By 2016 and 2017, Iraqi forces, supported by Kurdish Peshmerga and coalition airstrikes, began reclaiming major strongholds, including Fallujah and Mosul. Prime Minister Haider al-Abadi officially declared the defeat of the Islamic State on December 9, 2017.
Despite the official declaration of victory, the conflict did not vanish. The group transitioned into a guerrilla insurgency, utilizing remote hideouts in the western desert to launch hit-and-run attacks. By 2018, remnants of the organization continued to target civilians and security forces in provinces like Diyala and Kirkuk. The war also complicated Iraq's internal politics, notably following a 2017 Kurdish independence referendum that resulted in the Iraqi military reclaiming disputed territories like Kirkuk, effectively stalling the Kurdish state-building project. The legacy of the conflict remains a complex mix of military success and ongoing regional instability.
Source: War in Iraq (2013–2017)
