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,...