The Spy of the Rebellion, Being a True History of the Spy System of the US Army During the Late Rebellion
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"Revealing many secrets of the war hitherto not made public. Compiled from official reportsprepared for President Lincoln, General McClellan and the Provost-Marshal-General. " The author, Allan Pinkerton, under the name of Major E. J. Allen was chief of the US Secret Service. Originally published in 1883.