The law that regulates armed conflicts is one of the oldest branches of international law, and yet continues to be one of the most dynamic and relevant areas of law today. Now in its third edition, this textbook provides an accessible, scholarly, and up-to-date examination of international humanitarian law, offering students and teachers a comprehensive and logical discussion and analysis of the law. The textbook contains detailed examples, extracts from relevant cases, and useful discussion questions and a recommended reading list for each chapter, to help students and teachers alike engage with the subject matter, and grasp how the theory and the practice interact. Developing and emerging trends in theory and practice of international humanitarian law are also explored and examined, allowing for readers to build on their knowledge, and grapple with some of the biggest challenges facing the law of armed conflict in the twenty-first century.