The Routledge Handbook on Defence Studies provides a comprehensive guide to the key debates around defence studies in the 21st century.

Defence studies is a multi-disciplinary study of how agents, predominantly states, prepare for and go to war. Where security studies has been broadened and stretched to cover at times the near totality of international and domestic affairs and war studies has come to mean more than just operations and tactics but also experiences and outcomes, defence studies remains a coherent area of study primarily aimed at how defence policy changes over time...