[citation needed] On 11 June 2014, ISIL insurgents advanced into Baiji, seizing the main court house and police station and setting them on fire.

An official from inside the refinery stated the militants had captured 75 percent of the facility, while a military spokesman claimed the attack had been repelled with 40 insurgents being killed.

On 19 June, Iraqi government forces claimed to have regained full control of the Baiji oil refinery, after heavy fighting that left 100 militants dead.

An Iraqi witness who drove past the Baiji refinery told the Associated Press that ISIL had hung their banners from the watch towers and created checkpoints surrounding the facility, despite government claims of control.

[33] Between 13 and 18 December, ISIL recaptured seven neighborhoods, including the central part of the city, after Iraqi government forces retreated, due to a lack of support and ammunition.

[39] On 31 October, the Iraqi forces entered the town and captured two neighborhoods before their operations were halted due to a triple ISIL suicide-attack, followed by a ground assault, on the Army headquarters at the Tikrit University further south.

[citation needed] On 10 November 10, a British MQ-9 Reaper identified and attacked a group of ISIL militants which had been laying improvised explosive devices in the area.

[citation needed] The next day, Iraqi forces reached the facility's gates, breaking the ISIL siege of the refinery.

[50] Between 13 and 18 December, ISIL recaptured seven neighborhoods, including the central part of the city, after Iraqi government forces retreated, due to a lack of support and ammunition.

On 16 January 2015, A patrol of Tornado GR4's, operating near Baiji in support of Iraqi ground forces, attacked three ISIL positions with Paveway IV laser-guided bombs.

[55] On 4 February 2015, a pair of Tornado GR4's conducted an armed reconnaissance patrol over Baiji in support of Iraqi ground forces.

Two ISIL armoured vehicles were identified in a building and were attacked with two Paveway IV laser-guided bombs, scoring two direct hits.

[citation needed] On 11 April 2015, ISIL launched an assault on the Baiji Oil Refinery, claiming to have seized full control of it, which Iraqi forces denied.

[1] On 14 April, it was reported that Iraqi General Ayub Khalif was killed by ISIL while defending the Baiji Oil Refinery, along with 9 of his men.

[9] On 17 April, it was reported that ISIL withdrew from most parts of the Baiji Oil Refinery, after suffering high casualties inflicted by entrenched Iraqi Volunteers Forces.

[1] On 27 April, ISIL militants launched an attack on the Baiji Oil Refinery, destroying three depots and several Iraqi forces.

[69] On 7 June, Iraqi Security Forces and al-Hashd al-Shaabi militia, with aid from US-led Coalition airstrikes, captured the downtown area of Baiji, including the local government building.

[76][77] On 29 June 2015, Iraqi forces, supported by Shi'ite militias, reportedly recaptured the Baiji Oil Refinery from ISIL.

On 30 June, it was revealed that a small number of ISIL sleepers were still hiding inside Baiji city and its refinery, ambushing Iraqi fighters and hampering the cleanup process with guerrilla attacks and suicide bombings.

[13] On 29 July, three ISIL suicide bombers attacked a suburb of Baiji and tried to clear the way for other militants, killing 11 Iraqi fighters and wounding 21 others.

[21] On 2 September, ISIL fighters recaptured parts of the city, undoing much of the gains the Iraqi army had made in the preceding months.

Iraqi security forces and Shiite militias were primarily entrenched in the south of the city and were unable to cut supply lines to ISIL controlled areas.

Iraqi officials said that after the conclusion of the battle, they planned to retake the towns of Al-Shirqat and Hawija, where they expected heavy clashes.

[17][90][91] However, pockets of ISIL resistance continued to persist in some parts of Baiji city,[92] until they were finally cleared by the Iraqi Army and Shi'ite forces on 22 October.

[91] On 22 October, chairman of the US Join Chiefs of Staff Joseph F. Dunford stated that Iraqi forces had successfully recaptured the oil refinery city of Baiji.

[94] Brett McGurk, the Deputy Special Presidential Envoy for the Global Coalition to Counter ISIL, stated that the US had conducted 130 airstrikes in the Baiji region since August 2015, in support of the Iraqi Army and the Shi'ite militias.

[95] Additionally, on 23 October it was also reported that members of the Popular Mobilization Forces were bombing houses and government buildings of former Iraqi generals who had fought in the Iran–Iraq War.