Bashar al-Assad has failed to quell a stubborn rebellion despite his regime’s massive edge in military manpower and weaponry — but also because of these material advantages. His forces, replete with heavy armor, attack aircraft, and big guns, have tried to use something akin to our Powell Doctrine of “overwhelming force.” Yet the insurgents’ nimble, loose-jointed networks of small cells have slipped most of the heavy punches thrown at them, and they have launched increasingly stinging counter-blows of their own.