Salt Creek Canyon massacre
1858 CE.
Shown on the map at 39.703°, -111.707°.
The Salt Creek Canyon massacre occurred on June 4, 1858, when four Danish immigrants were ambushed and killed by unidentified Indians in Salt Creek Canyon, a winding canyon of Salt Creek east of present-day Nephi, in Juab County, Utah.
Text from the Wikipedia article Salt Creek Canyon massacre, licensed CC BY-SA 4.0.