Battle of Baghuz Fawqani

The Battle of Baghuz Fawqani was an offensive by the Syrian Democratic Forces (SDF), assisted by Combined Joint Task Force – Operation Inherent Resolve (CJTF-OIR) coalition airstrikes, artillery, and special forces personnel, that began on 9 February 2019 as part of the Deir ez-Zor campaign of the Syrian Civil War. The battle—which was composed of a series of ground assaults—took place in and around the Syrian town of Al-Baghuz Fawqani in the Middle Euphrates River Valley near the Iraq–Syria border, and was the territorial last stand of the Islamic State (IS) in eastern Syria.

After corralling IS forces into a densely populated cluster of hamlets and a tent city along the riverside within the first week, the SDF realised that a greater-than-anticipated number of civilians, most of whom were relatives of the what were now mostly foreign IS fighters, were still in the enclave. With CJTF-OIR oversight, the SDF took an incremental approach to the battle, launching assaults then pausing to allow surrendering fighters, hostages, and families to evacuate in order to minimize civilian casualties. The "trickle-out" strategy, coupled with stiff resistance by veteran Islamic State jihadists within a small dense area, prolonged the battle into a protracted siege. The SDF officially declared final victory over the IS in Baghuz Fawqani on 23 March, marking the end of IS-controlled territories in Syria.

During the battle, on 18 March, a coalition airstrike killed many people. The incident, of which disclosure was suppressed by the U.S. military, killed up to 80 people, including 64 civilians and 16 IS militants according to The New York Times, who revealed it to the public in November 2021.

A US military investigation in May 2022 concluded that the airstrike killed 52 IS fighters and 4 civilians and did not violate the laws of war.