One map of Chattanooga, Tennessee, and its approaches showing the Union and Rebel works in 1863. Map was surveyed under the direction of Brigadier General William F. Smith, Chief Engineer of the Military Division of the Mississippi, during parts of November and December 1863 by F.W. Dorr, U.S. Coast Survey.
During the 1863 siege of Chattanooga, Union generals put a special group of men to work mapping the entire area surrounding the city. Members of the United States Coast Survey (the institutional and professional ancestor of the National Oceanic and Atmospheric Agency) were brought to Chattanooga to produce maps that would help the Union army break the siege. Led by F.W. Dorr, they went to work in October scouting, sketching, calculating and drawing. The knowledge they produced, most importantly of elevations on Missionary Ridge, provided Ulysses S. Grant and his subordinates critical information used to drive Braxton Bragg’s Army of Tennessee off Missionary Ridge. Within weeks of the battle’s end, Dorr’s engineers completed their maps of the Chattanooga area, including detailed renderings of every trench and rifle pit dug by the opposing armies between September 21, 1863 and November 25, 1863.
The last image attached to this record shows a 2015 Google map overlay onto the 1863 map.
|Dates of Creation||November and December 1863|
|Extent of Description||41.00" x 33.00"|
|Lexicon category||8: Communication Artifact|
|Lexicon sub-category||Documentary Artifact|