Book excerpt: The first comprehensive study of this war helps us understand how each country to defend the frontier, and the political issues which drove the Anglo-Scottish wars of the 1520s. The Anglo-Scottish War of 1522-1524 saw the mobilisation of tens of thousands of men and vast amounts of resources in both England and Scotland. Beyond its British context, the war had a European significance: it formed an element in the wider Valois-Habsburg struggles over Italy, with the complex systems of alliances spreading the repercussions of this struggle far across the continent and to the borders of England and Scotland. Recent years have seen the emergence of a renewed debate around the status of the Anglo-Scottish frontier and the wider political and social conditions which predominated in the borderlands of each kingdom. Although there has been a move to present the Anglo-Scottish border as a porous frontier where the populations on either side were closely connected, these neighbourly links imploded rapidly in wartime when frontier populations were co-opted into a national struggle. It is significant that borderers were responsible for inflicting the heaviest violence on each other during the war. Drawing on an unprecedented access to English and Sottish sources of the conflict, this book offers an important new contribution to both Scottish and English history as well as the wider military history of late medieval and early modern Europe. Aspects of military mobilisation, logistics, the defence of frontiers, the use of violence against civilians and wartime espionage feature prominently.