In late March 1909, five sheepmen headed east from the town of Worland, in north-central Wyoming, driving five thousand sheep. A few days later the men and their sheep camped on the banks of Spring Creek, where they thought they had brought the herd to safe grazing. That evening, however, seven cowboys raided the camp and brutally murdered three of the sheepmen. In A Vast Amount of Trouble, John W. Davis recounts the events leading up to this crime, the gripping trial that followed, and the trial’s aftermath, which was no less than to bring an end to Wyoming’s violent range wars.