'To Walk in the Dark': Military Intelligence in the English Civil War, 1642-1646

In 'To Walk in the Dark', intelligence specialist John Ellis presents the first comprehensive analysis of the First English Civil War intelligence services. He details the methods of the Roundhead spies who provided their commanders with a constant flow of information about the movements of the King's armies, describes the earliest use of code-breaking and mail interception and shows how the Cavalier intelligence forces were overcome. He also reveals the intelligence personnel themselves: the shadowy spymasters, agents and femme fatales.

The descriptions of how intelligence information was used in the main battles are particularly fascinating and show how intelligence information played a decisive role in determining the outcome of the Civil War itself.