...sketches which had haunted Longfellow ever since Outre-Mer. The Norman Baron was the result of a passage from Thierry, sent him by an unknown correspondent. One poem was suggested by a passage in Andersen 's Story of my Life, and one was written at Boppard on the Rhine. All the rest were distinctly American in character or origin. Another poem, To the Driving Cloud, the chief of the Omaha Indians, ...