From U.S. soldiers having to fight children in Afghanistan and Iraq to juvenile terrorists in Sri Lanka to Palestine, the new, younger face of battle is a terrible reality of 21st century warfare. Indeed, the very first American soldier killed by hostile fire in the "War on Terrorism" was shot by a fourteen-year-old Afghan boy. Children at War is the first comprehensive examination of a disturbing and escalating phenomenon: the use of children as soldiers around the globe. Interweaving explanatory narrative with the voices of child soldiers themselves, P.W. Singer, an internationally...