Large-scale detention operations in international armed conflicts (IACs) pose significant humanitarian, legal, and operational challenges. International humanitarian law (IHL) provides detailed rules governing the treatment and protection of persons deprived of liberty, whether they are prisoners of war, other persons interned for security reasons, or other protected persons. These obligations, enshrined primarily in the Third and Fourth Geneva Conventions, require not only compliance once the armed conflict begins, but advance planning during peacetime. Without the appropriate institutions, infrastructures, and trained personnel in place beforehand, states risk falling short of their legal obligations when hostilities erupt, to the detriment of detainees’ rights and dignity.

In this post, ICRC Legal Advisers Sylvain Vité and Isabelle Gallino explore what it takes to comply with IHL in large-scale detention operations during IACs, focusing on the preparatory measures that states must undertake long before the first capture. Building on the previous post in this series, they highlight the critical need to establish functioning legal and administrative mechanisms, ensure the availability of adequate facilities and resources, and embed IHL training across relevant personnel.