Cell phones, radio and satellite communications didn’t exist during the time of the U.S. Civil War. Some of the communications traffic of war was carried on telegraph wire but lines were missing, short on capacity and unreliable for important communications.
One of the the old standards of communications was employed to alert the city of impending problems along with the ability to send and receive limited communications through signals.
Below is one of the Signal Towers in Washington D.C. in 1865.
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