Statistics for occurrence #1 of “Mr. Dunn” in chapter 10 of Allan Pinkerton, The spy in the rebellion; being a true history of the spy system of the United States Army during the late rebellion, revealing many secrets of the war hitherto not made public, compiled from official reports prepared for President Lincoln , General McClellan and the Provost-Marshal-General .:

...soon upon my way. Timothy Webster, meanwhile, had proceeded on his journey from Perrysville, and arrived without accident or adventure in Philadelphia. He immediately repaired to the office of Mr. Dunn , who informed him that he had just received a dispatch for him from Chicago. Webster hastily opened the message and found my directions for him to await my return at the city of Pittsburg. Remain...
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