is a prolific writer of military fiction and non-fiction, having sold some 3-1/2 million copies in the UK alone and has been translated into most European languages. His non-fiction books include West Wall, The Battle for Hitler's Siegfried Line, '44: In Combat from Normandy to the Ardennes, The Battle of Hurtgen Forest, The Last Assault, Bloody Aachen, Decision at St Vith and many others.