At the outset of the Great War, James Stonebridge, a patrician New England Yankee and Obadaiah Nelson, a gumbo ya-ya Louisiana native, volunteer with the French Foreign Legion in Paris. They are among the handful of Americans who did so at the time, young men filled with idealism and lured by romantic notions of adventure. Despite their different backgrounds, the two form a deep and unexpected friendship that helps them endure the brutal reality of the trenches, ...