Battle of the Cumberland Gap
1863 CE.
Shown on the map at 36.608°, -83.674°.
The September 7–9, 1863 fall of the Cumberland Gap was a victory for Union forces under the command of Ambrose Burnside during his American Civil War campaign for Knoxville. The bloodless engagement cost the Confederates 2,300 men captured and control of the Cumberland Gap.
Text from the Wikipedia article Battle of the Cumberland Gap (1863), licensed CC BY-SA 4.0.