How was ISIL driven from the Libyan city of Sirte in 2016?

In 2016, the militant extremist group Islamic State in Iraq and the Levant (ISIL) was driven from the central coastal city of Sirte, Libya, through a coordinated military effort. A coalition of western Libyan militias confronted the group, ultimately dislodging them from the city and the surrounding area with the assistance of U.S. air support. By December 2016, Libyan forces had successfully recaptured the city, which had served as a strategic link between the eastern and western halves of the country since the group took control in mid-2015.12