References
Videos for further learning
The American Civil War Oversimplified
Civil War Telegraph System
Civil War Signals
The American Civil War
The Antietam Battle
https://www.history.com/this-day-in-history/union-troops-discover-rebels-antietam-battle-plan
https://www.history.com/news/7-ways-the-battle-of-antietam-changed-america
https://www.archives.gov/exhibits/featured-documents/emancipation-proclamation
The Telegraph and The Civil War
The Military Telegraph During the Civil War in the United States By William Rattle Plum
https://warfarehistorynetwork.com/2015/11/15/civil-war-weapons-the-telegraph/
The Stager Cipher. (2020, November 4). Retrieved May 28, 2021, from https://k12.libretexts.org/@go/page/11564
McNamara, Robert. “Abraham Lincoln and the Telegraph.” ThoughtCo, Oct. 1, 2018,
http://thoughtco.com/abraham-lincoln-and-the-telegraph-1773568
News and The Civil War
https://americanantiquarian.org/earlyamericannewsmedia/exhibits/show/news-and-the-civil-war