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
The Wild Bunch his previous film "Major Dundee" (1965) and his firing from the set of "The Cincinnati Kid" (1965), Peckinpah's stock had improved following his critically acclaimed work on the television film "Noon Wine" (1966). An alternative screenplay available at the studio was "The Wild Bunch", written by Roy Sickner and Walon Green. At the time, William Goldman's screenplay "Butch Cassidy and the Sundance Kid" had recently been purchased by 20th Century Fox. It was quickly decided that "The Wild Bunch", which had several similarities to Goldman's work, would be produced in order to beat "Butch Cassidy" to the theaters. By the