In May 1869, a one-armed Civil War veteran and a ragtag band of nine mountain men embarked on the last great quest in the American West: the fabled Grand Canyon. Drawing on rarely examined diaries and journals, this is the first book to tell the full, dramatic story of John Wesley Powells expedition. 16-page photo insert. Maps and index. n nDrawing on rarely examined diaries and journals, Down the Great Unknown is the first book to tell the full, dramatic story of the Powell expedition. n nOn May 24, 1869 a one-armed Civil War veteran, John Wesley Powell and a ragtag band of nine mountain men embarked on the last great quest in the American West. The Grand Canyon, not explored before, was as mysterious as Atlantis--and as perilous. The ten men set out from Green River Station, Wyoming Territory down the Colorado in four wooden rowboats. Ninety-nine days later, six half-starved wretches came ashore near Callville, Arizona.n nLewis and Clark opened the West in 1803, six decades later Powell and his scruffy band aimed to resolve the Wests last mystery. A brilliant narrative, a thrilling journey, a cast of memorable heroes--all these mark Down the Great Unknown, the true story of the last epic adventure on American soil.n