This blog post explores the classification under IHL (International Humanitarian Law) of non-consensual State interventions against an organized armed group (OAG). It argues in favor of a single classification of non-international armed conflict (between the intervening State and the OAG) and against a double classification of non-international armed conflict and international armed conflict (between the intervening State and the territorial State). This blog post thus explains why the double classification theory is not adequate.