Endorsements: 'One of the most rigorous, best researched and informed account of Islamic militancy available today. Tawil's deep understanding, fine analysis, eye for detail and the reams of new material gathered in years of reporting makes this work invaluable to the scholar and general reader alike.' Jason Burke, author of Al-Qaeda: The True Story of Radical Islam 'Camille Tawil delivers a carefully reported assessment of al Qaeda and its affiliated Arab jihadist groups - [this is] an important addition to the studies of al Qaeda and the other militant groups it has influenced.' Peter Bergen, author of Holy War, Inc. and The Osama bin Laden I Know 'Among the best works in English on the Sunni Islamist phenomenon and the role of Osama bin Laden and al-Qaeda therein - Tawil's book is a long-needed, detailed, and primary source based analysis of the structure, evolution, and operations of the Maghreb's Sunni militant groups - Brothers in Arms sheds a clear and indispensable - if troubling - light on a religious war that is far from over.' Michael F. Scheuer, former CIA Head of Bin Laden Unit and Professor of Security Studies, Georgetown 'Brothers in Arms is a must-read for anyone interested in the evolution of militant Islam in the region and beyond.' Alison Pargeter, author of The Muslim Brotherhood: The Burden of Tradition