Tom Horn see as a warning. During the Wilcox train robbery investigation, Horn obtained information from Bill Speck that revealed which of the robbers had killed Sheriff Josiah Hazen during their escape. Either George Curry or Harvey "Kid Curry" Logan were said to have killed the sheriff. Both outlaws were members of Butch Cassidy's Wild Bunch gang, then known as "The Hole-in-the-Wall Gang" after their hideaway in the mountains. Horn passed this information on to Charlie Siringo, who was working the case for the Pinkertons. Horn briefly entered the United States Army to serve during the Spanish–American War as the chief packer
Butch Cassidy they fled again to the Robbers Roost. On June 2, 1899, the gang robbed a Union Pacific "Overland Flyer" passenger train near Wilcox, Wyoming, a robbery which earned the Wild Bunch a great deal of notoriety and resulted in a massive manhunt. Many notable lawmen of the day took part in the hunt for the robbers, but they were not found. During a shootout with lawmen following the train robbery, both Kid Curry and George Curry shot and killed Sheriff Joe Hazen. Tom Horn, a killer-for-hire employed by the Pinkerton Agency, obtained information from explosives expert Bill Speck about the