Wickenburg Massacre
1871 CE.
Shown on the map at 33.963°, -112.797°.
The Wickenburg Massacre was the November 5, 1871, murder of six stagecoach passengers en route westbound from Wickenburg, Arizona Territory, headed for San Bernardino, California, on the La Paz road.
Text from the Wikipedia article Wickenburg Massacre, licensed CC BY-SA 4.0.