David: Just happened upon an arty inspector's report of DC forts, dtd 17 May 1864, filed to Gen. Halleck, C/S, that may be of interest: "There is no communication between the forts by signal, nor between the outside and the forts. Signals are made from the outside of the works directly to department headquarters, and from thence to headquarters of the divisions south of the Potomac by telegraph. I recommend that signal communication be had between the outside and the forts, and between the forts." [OR, ser I, Vol. 36, Pt. 2, p. 885.]
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