This book examines the rapid evolution of drone technology in modern warfare, tracing its progression from manually piloted systems to advanced platforms driven by artificial intelligence and machine learning. Drawing on real-world experience in Ukraine and supported by clear technical explanation, it shows how unmanned systems moved beyond experimental concepts and hobbyist kits to become essential battlefield assets. Central to the book is a hands-on DIY drone build project that guides readers through design, assembly, and configuration, while explaining critical components, control software, and core flight theory. It also breaks down the principles behind AI-assisted navigation, adaptive flight behaviour, and emerging autonomous decision-making in an accessible and practical manner. In addition, the book explores anti-drone defence systems, including detection, electronic warfare, and interception technologies, illustrating the ongoing contest between unmanned threats and countermeasures through real-life examples and operational context.