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's Wild Bunch and two deputies were killed. Gang member Sam Ketchum was wounded and died in custody. Elzy Lay, one of Cassidy's closest friends and cofounder of the Wild Bunch gang, was wounded and also captured. Cassidy and the other members regrouped in Wyoming. On August 29, 1900, Cassidy, the Sundance Kid, Kid Curry and another unidentified gang member believed to have been Will Carver, held up another Union Pacific train at Tipton, Wyoming. Less than a month later, on September 19, 1900, they raided the First National Bank of Winnemucca, Nevada, stealing $32,640. These and other lucrative robberies led to much