New in softcover. Hardcover was published in 2022. This Handbook proceeds from values protected by international law (Part I), through substantive rules in which these values are embodied (Part II), to international and domestic institutions that enforce the law (Part III). It subsequently deals with current challenges in the application of rules of international conflict and security law (Part IV), and crimes as the most serious violations of those rules (Part V). Finally, in the section on case studies (Part VI), lessons learnt from a number of conflict situations are discussed.