Dr Christopher Duffy read history at Balliol College, Oxford and in 1961 he joined the staff of the Royal Military Academy Sandhurst. He has written books on eighteenth century and Napoleonic warfare, fortification, armoured warfare in World War II and modern strategic geography. He was senior lecturer in the Department of War Studies at the Royal Military Academy Sandhurst and is now Research Professor in War in History at the Institute for the Study of War and Society at De Montfort University.