Communications and Intelligence
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Allan Pinkerton, chief of McClellan's secret service, with his men near Cumberland Landing, Va., May 14, 1862. (Pinkerton is smoking a pipe.) Photographed by George N. Barnard and James F. Gibson.


Federal observation balloon Intrepid being inflated. Battle of Fair Oaks, Va., May 1862.


Scouts and guides for the Army of the Potomac, Berlin, Md., October 1862. Photographed by Alexander Gardner.


Constructing telegraph lines, April 1864. Photographed by Timothy H. O'Sullivan.


Signal Tower at Cobb's Hill, near New Market, Va., 1864.


A New York Herald Tribune wagon and reporters in the field.


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