When gold was discovered in Grasshopper Creek in 1862 it did not take long for a crowd of guys to show up looking for more of the shiny stuff. Soon a mining camp was established.
The inhabitants decided to name the place Bannock for a tribe of Indians in the area. However, the name was misspelled when it was submitted to Washington D.C. for a Post Office. In very short order stores and saloons were built and the Hurdy Gurdy Girls arrived.
photo scanned from info brochure
The new sheriff turned out to be one of the bad guys so a mob of vigilantes lynched him and his gang. By the next spring the population had swelled to 3000. When the Montana Territory as organized in1864, President Lincoln appointed Sidney Edgerton Territorial Governor.