Philip Warner left Cambridge in 1939 and joined the Army at the outbreak of war. He served until 1945, mainly in the Far East. Subsequently, he became Assistant-Principal in H.M. Treasury, lectured for the British Council in Spain, and is now a Senior Lecturer at the Royal Military Academy, Sandhurst. He is well known as a military historian and among his published works are 'Sieges of the Medieval Ages', 'The Medieval Castle' and 'The S.A.S. 1941-71'. He is also author of all the titles in Osprey's 'British Battlefields' series.