Communications and Intelligence
16. Federal Observation Balloon Intrepid being Inflated - Battle of Fair Oaks, VA, May 1862
17. Scouts and Guides for the Army of the Potomac - Berlin, MD, October 1862
18. Teams Constructing Telegraph Lines -April 1864
19. Signal Tower at Cobb's Hill, Near New Market, VA, 1864
237. Members of the Bureau of Military Information - Bealeton, VA, Aug 1863
Colonel George H. Sharpe, John C. Babcock, Unidentified, and Lt. Colonel John McEntee
696. Two Youthful Military Telegraph Operators at Headquarters - Petersburg, VA, August 1864
226. Allan Pinkerton on Horseback
825. Scouts and Guides of the Army of the Potomac - Brandy Station, VA, March 1864