Statistics for occurrence #1 of “Secretary Seward” 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.:

... and the Department of the Navy each took a hand in early attempts to define the line between loyalty and disloyalty to the Union cause, but upon that of State fell the greater share of the effort. Secretary Seward engaged a force of detectives, and sent them to Canada and frontier places to intercept all communication between the British dominion and the South. He assigned other secret agents to the specific...
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