Iraqi Civil War: Mosul is declared fully liberated from the Islamic State of Iraq and the Levant by the government of Iraq.

The War in Iraq (2013–2017) was an armed conflict between Iraq and its allies and the Islamic State. Following December 2013, the insurgency escalated into a full-scale war following clashes in parts of western Iraq, which culminated in the Islamic State offensive into Iraq in June 2014, leading to the capture of the cities of Mosul, Tikrit and other cities in western and northern Iraq by the Islamic State. Between 4–9 June 2014, the city of Mosul was attacked and later fell; following this, Prime Minister Nouri al-Maliki called for a national state of emergency on 10 June. However, despite the security crisis, Iraq's parliament did not allow Maliki to declare a state of emergency; many legislators boycotted the session because they opposed expanding the prime minister's powers. Ali Ghaidan, a former military commander in Mosul, accused al-Maliki of being the one who issued the order to withdraw from the city of Mosul. At its height, ISIL held 56,000 square kilometers of Iraqi territory, containing 4.5 million citizens.