In this sweeping adventure story, Stephen E. Ambrose, the bestselling author of "D-Day," presents the definitive account of one of the most momentous journeys in American history. Ambrose follows the Lewis and Clark Expedition from Thomas Jefferson's hope of finding a waterway to the Pacific, through the heart-stopping moments of the actual trip, to Lewis's lonely demise on the Natchez Trace. Along the way, Ambrose shows us the American West as Lewis saw it -- wild, awsome, and pristinely beautiful. "Undaunted Courage" is a stunningly told action tale that will delight readers for generations. illustration and maps