2017 Western Iraq campaign in the context of "Operation Inherent Resolve"

On 15 June 2014 U.S. President Barack Obama ordered United States forces to be dispatched in response to the Northern Iraq offensive (June 2014) of the Islamic State (ISIL), as part of Operation Inherent Resolve. At the invitation of the Iraqi government, American troops went to assess Iraqi forces and the threat posed by ISIL.

In early August 2014, ISIL began its Northern Iraq offensive. On 5 August, the United States started supplying the Kurdish Peshmerga forces with weapons. On 8 August, the United States began airstrikes against ISIL positions in Iraq. Nine other countries also launched airstrikes against ISIL, more or less in concert with Kurdish and Iraqi government ground troops. By December 2017, ISIL had no remaining territory in Iraq, following the 2017 Western Iraq campaign.

The Islamic State (IS) had its core in Iraq and Syria from 2013 to 2017 and 2019 respectively, where the proto-state controlled significant swathes of urban, rural, and desert territory, mainly in the Mesopotamian region. Today the group controls scattered pockets of land in the area, as well as other minor strongholds or underground insurgent cells in other areas, notably Afghanistan, West Africa, the Sahara, Somalia, Mozambique, and the Democratic Republic of the Congo. As of 2023, large swathes of Mali have fallen under IS control.

In early 2017, IS controlled approximately 45,377 square kilometers (17,520 square miles) of territory in Iraq and Syria and 7,323 km of territory elsewhere, for a total of 52,700 square kilometres (20,300 sq mi). This represents a substantial decline from the group's territorial peak in late 2014, when it controlled between 100,000 and 110,000 square kilometres (39,000 and 42,000 sq mi) of territory in total. IS territory has declined substantially in almost every country since 2014, a result of the group's unpopularity and the military action taken against it. By late March 2019, IS territory in Syria was reduced to only the besieged 4,000 km (1,550 sq mi) Syrian Desert pocket. The enclave was surrounded by Syrian government forces and its allies. The Syrian military conducted combing operations and airstrikes against the pocket, but with limited success. IS propaganda claims a peak territorial extent of 282,485 km.

The Eastern Syria campaign of September–December 2017 was a large-scale military operation of the Syrian Army (SAA) and its allies against the Islamic State of Iraq and the Levant (ISIL) during the Syrian Civil War. Its goal was to clear the city of Deir ez-Zor of any remaining ISIL forces, capture ISIL's de facto capital of Mayadin, as well as seize the border town of Abu Kamal, which became one of ISIL's final urban strongholds by the latter stages of the campaign.

The campaign was concurrent with the 2017 Western Iraq campaign, the Raqqa campaign conducted by the Syrian Democratic Forces (SDF) against ISIL's former capital city of Raqqa, as well as with the SDF's offensive in Deir ez-Zor province along the eastern banks of the Euphrates River.