G. D. SHEFFIELD is Senior Lecturer in Defence Studies, King's College London and teaches at the Joint Services Command and Staff College where he specialises in Land Warfare. From 1985 to 1999 he was a member of the Department of War Studies, Royal Military Academy Sandhurst. He has published a number of books and articles including The Redcaps: A History of the Royal Military Police (1994) and Leadership and Command (editor, 1997). - GEOFFREY TILL is the Dean of Academic Studies at the Joint Services Command and Staff College, Bracknell and is the Head of the Defence Studies Department. He is also Visiting Professor in Maritime Studies in the Department of War Studies at King's College London. In addition to many articles and chapters, he is the author of a number of books.