Battle of Black Jack
1856 CE.
Shown on the map at 38.762°, -95.131°.
The Battle of Black Jack took place on June 2, 1856, when antislavery forces, led by the noted abolitionist John Brown, attacked the encampment of Henry C. Pate near Baldwin City, Kansas. The battle is cited as one incident of "Bleeding Kansas" and a contributing factor leading up to the American Civil War of 1861 to 1865.
Text from the Wikipedia article Battle of Black Jack, licensed CC BY-SA 4.0.