By focusing on four specific hotbeds of instability-Somalia, Chechnya, Afghanistan, and Iraq-Richard H. Shultz Jr. and Andrea J. Dew carefully analyze tribal culture and clan associations, examine why "traditional" or "tribal" warriors fight, identify how these groups recruit, and where they find sanctuary, and dissect the reasoning behind their strategy. Their new introduction evaluates recent developments in Iraq and Afghanistan, the growing prevalence of Shultz and Dew's conception of irregular warfare, and the Obama Defense Department's approach to fighting insurgents, terrorists, and militias. War in the post-Cold War era cannot be waged through traditional Western methods of combat, especially when friendly states and outside organizations like al-Qaeda serve as powerful allies to the enemy. Bridging two centuries and several continents, Shultz and Dew recommend how conventional militaries can defeat these irregular yet highly effective organizations.