This volume is the result of a conference at University College London in 2007 which addressed the scale and form of civil defences in early medieval Europe, c. 800-1000. Previous work has largely focussed on individual sites or specific categories of evidence. These papers offer new interdisciplinary perspectives driven by a landscape approach. Several contributions focus on civil defence in England around the time of King Alfred the Great, and together provide a new agenda for the study of Anglo-Saxon military landscapes. European case-studies facilitate a comparative approach to local and regional defensive structures and interpretive paradigms. Topics and themes covered include civil defence landscapes, the organization and form of defensive structures, and the relationships and dynamics between social complexity, militarization, and external threats. With papers ranging from England to Spain and Germany to Scandinavia the volume is of relevance to a range of disciplines including archaeology, history, onomastics, geography, and anthropology.