Spies, Scouts and Secrets in the Gettysburg Campaign, Thomas J. Ryan

Looks at the intelligence resources available to the Union and Confederate commanders during the Gettysburg campaign, the information they provided and the impact (or lack of) that that information had on the events of the campaign. A valuable addition to the literature on Gettysburg, looking at a key element of the campaign, and an area in which the Union forces had a clear advantage of their Confederate opponents
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