Ever wonder why militant groups behave as they do? For instance, why did Al Qaeda attack the World Trade Center whereas other groups like the African National Congress tried to avoid civilian bloodshed? Why does Islamic State brag over social media about its gory attacks, while Hezbollah denies responsibility or even apologizes for its carnage? This book argues that militant group behaviour depends on the tactical intelligence of the leaders. The author has extensively studied the political plights of hundreds of militant groups throughout world history and argues that there are three rules successful militant leaders have followed. These rules are based on original insights from numerous disciplines (e.g., communication, criminology, economics, history, management, marketing, political science, psychology, sociology) and methodological approaches (e.g., qualitative cases studies, content analysis, network analysis, regression analysis, experiments), demonstrating that there is a science to victory in world history. But even rebels must follow rules.