The Battle for Iraq: Shia Militias vs. the Islamic State

Last summer, the group known as the Islamic State of Iraq and Syria (ISIS) swept from Syria into northern Iraq, routing Iraqi security forces and seizing the city of Mosul. Soon afterward, the group declared the establishment of a dubious “caliphate“ in the area it controls and rebranded itself the Islamic State. With Iraq’s army weakened and radical militants advancing on Baghdad, the country’s Iran-backed Shia militias — which have their own history of sectarian abuses — fought back, halting the Islamic S