Richard Baxter famously stated that “the first line of defence against international humanitarian law is to deny that it applies at all”. While “under-classification” remains an issue today, a parallel trend needs to be acknowledged. This is the tendency to over-classify situations of violence, especially in relation to transnational terrorist organizations such as the so-called Islamic State group or Al-Qaeda. This tendency stems from practical difficulties inherent in the changing operational environment. The last few years have witnessed a proliferation of armed non-State actors that are labelled or designated as terrorists (e.g., in Iraq, Syria, Mali, Nigeria and Yemen). Terrorist groups are characterized by opaque, often volatile organ...