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Invisible Ink: Spycraft of the American Revolution
By John A. Nagy. ISBN: 978-1-59416-097-4. Copyright 2010. Hardcover with 381 pages including notes, appendices, bibliography, and index.
During the American Revolution, espionage was critical to the successes and failures of both Continental and British efforts. General George Washington relied on a vast spy network and personally designed sophisticated battle plan deceptions and counterintelligence efforts. Washington’s use of spycraft included codes, ciphers and spy rings, most notably the Culper ring which operated in British-controlled New York City.