Statistics for occurrence #1 of “Lieutenant H. B. Smith” in chapter 14 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 8: Soldier Life and Secret Service.:

...when they evacuated Atlanta. head of the Bureau of military information and supervised all its Secret-service work until the close of the war. He brought the Bureau to a state of great efficiency. Lieutenant H. B. Smith was chief detective of the middle Department, which comprised Maryland, Delaware, and part of Virginia. His headquarters was at Baltimore, one of the most fertile fields for the work of the Secret ...
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