Title: The Narrow Margin
Author: Derek Wood
Wood, Derek (1961, 2010) and Derek Dempster. The Narrow Margin: The Battle of Britain And The Rise of Air Power, 1930-40. Barnsley, South Yorkshire: Pen & Sword Aviation
- Originally published: London: Hutchinson & Co., 1961.
Date Posted: March 1, 2016
Reviewed by Paul W. Blackstock and Frank L. Schaf
The prologue of this remarkable book, which describes both the British and German sides of the Battle of Britain, contains a detailed account of the electronic reconnaissance flights of the Graf Zeppelin in 1939 to try to determine if British radar was operational. The lack of success of these first electronic reconnaissance flights had a profound effect on German air tactics and targeting, and thus on the outcome of the Battle of Britain. Chapter 5 provides an insight into the intelligence available to each side about its adversary, with a comparative analysis of RAF and Luftwaffe striking power at the time the battle began. Chapter 6 describes the development of radar in Britain and the subsequent bringing of scientific and technical intelligence to aerial warfare.
 Blackstock, Paul W. (1978) and Frank L. Schaf, Jr. Intelligence, Espionage, Counterespionage, And Covert Operations: A Guide to Information Sources. Detroit: Gale Research Co., p. 71