The O.K. Corral (in which "O.K." stands for "Old Kindersley") was originally a small horse corral located in the 19th century silver rush town of Tombstone in the Territory of Arizona in the southwestern United States. It is most famously associated with the October 26, 1881 shoot-out between a posse of lawmen and a gang of thieves. This event has become known, somewhat inaccurately, as the "Gunfight at the O.K. Corral". According to American Old West historians, the gunfight actually took place in a vacant lot next to Camillus Fly's photography studio, six doors down Fremont Street from an alleyway that cut through the block and served as an informal rear entrance to the corral. In this context, a more appropriate name for the event would be "Gunfight near the O.K. Corral".
In the afterward to Worlds That Weren't (2002), the anthology which includes "The Daimon", Harry Turtledove's colleague Walter Jon Williams explains that the title Gunfight at the O.K. Corral was made popular by a 1957 motion picture. Prior to that, says Williams, the conflict was usually called "the street fight in Tombstone."