I would like to thank the staff at the National Archives, Kew; the Imperial War Museum, London; the British Library, London; and a special mention for Caroline Herbert at the Churchill Archives Centre, Churchill College, Cambridge. Many thanks for the helpful advice of Richard Stokes, Felix Sefton Delmer, Nigel West, and the late Lieutenant Colonel T. A. Robertson and his family for kindly supplying his photograph. At Osprey I would like to thank Anita Baker, Ruth Sheppard and Venetia Bridges for helping me to realize this project. Last, but by no means least, none of this would have been possible without the kind consideration and eternal patience of my wife, Sarah.