After the Islamic State seized large swathes of Syria and Iraq in 2013-14, the United States led a yearslong effort to roll back the group’s gains. Journalist and author Michael Gordon has written four books on the wars in Iraq, and in his latest, Degrade and Destroy, he takes us inside the war on the Islamic State, detailing the key White House deliberations and military struggles that finally resulted, in 2019, in the liberation of all the territories occupied by the group. Why did the United States fully withdraw from Iraq in 2011 only to return in 2014? What was the strategy for “degrading and destroying” the Islamic State adopted by the Obama administration, and how did it evolve over time? What did the advent of the Trump administration mean for the war effort? How successful, ultimately, was Operation Inherent Resolve, and why was it called this?