This book explores the international law framework governing the use of armed force in occupied territory through a rigorous analysis of the interplay between jus ad bellum, international humanitarian law, and international human rights law. Through an examination of state practice and opinio juris, treaty provisions and relevant international and domestic case law, this book offers the first comprehensive study on this topic. This book will be relevant to scholars, practitioners, legal advisors, and students across a range of sub-disciplines of international law, as well as in peace and conflict studies, international relations, and political science. This study will influence the way in which States use armed force in occupied territory, offering guidance and support in litigations before domestic and international courts and tribunals.