The book examines the military and law enforcement responses to international terrorism. Subjects include the legal authority to use military force; determining when the law of armed conflict comes into force; the law of targeting and how this authority is applied to terrorist operatives; preventive detention; prosecution of terrorists by military commission; the legal framework for gathering counter-terrorism intelligence information; prosecuting terrorists and their sponsors; freezing terrorist assets; and civil liability for personal injury or death caused by acts of international terrorism.