The cost of turning against the Islamic State was made brutally apparent in the streets of a dusty backwater town in eastern Syria in early August. Over a three-day period, vengeful fighters shelled, beheaded, crucified and shot hundreds of members of the Shaitat tribe after they dared to rise up against the extremists.
By the time the killing stopped, 700 people were dead, activists and survivors say, making this the bloodiest single atrocity committed by the Islamic State in Syria since it declared its existence 18 months ago.
The little-publicized story of this failed tribal revolt in Abu Hamam, in Syria’s eastern Deir al-Zour province, illuminates the challenges that will confront efforts to persuade those living under Islamic State rule — in Iraq as well as Syria — to join the fight against the jihadist group, something U.S. officials say is essential if the campaign against the militants is to succeed. […]