Media coverage of the Mountain Meadows Massacre
Although the Mountain Meadows massacre was covered to some extent in the media during the 1850s, its first period of intense nationwide publicity began around 1872. This was after investigators obtained the confession of Philip Klingensmith, a Mormon bishop at the time of the massacre and a private in the Utah militia.
Source: Wikipedia — Media coverage of the Mountain Meadows Massacre (CC BY-SA 4.0)