Increasingly, war is and will be fought by machines – and virtual networks linking machines - which, to varying degrees, are controlled by humans. This book explores the legal challenges for armed forces resulting from the development and use of new military technologies – automated and autonomous weapon systems, cyber weapons, “non-lethal” weapons and advanced communications - for the conduct of warfare. The contributions, each written by scholars and military officers with expertise in International Humanitarian Law (IHL), provide analysis and recommendations for armed forces as to how these new technologies may be used in accordance with international law. Moreover, the chapters provide suggestions for military doctrine to ensure continued compliance with IHL during this ever-more-rapid evolution of technology.