Alvin C. York went out on a routine patrol an ordinary, unknown American doughboy of the First World War. He came back from no-man's-land a hero. In a brief encounter on October 8, 1918, during the Argonne offensive, York had killed 25 German soldiers and, almost singlehandedly, effected the capture of 132 others. Returning to the United States the following spring, he received a tumultuous public welcome and a flood of offers from businessmen eager to capitalize on his acclaimed feat. But York, true to his character, went quietly back to his home in the Tennessee mountains, where he spent...