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Grenville Mellen Dodge (April 12, 1831 – January 3, 1916) was a Union Army officer on the frontier and a pioneering figure in military intelligence during the Civil War, who served as Ulysses S. Grant's intelligence chief in the Western Theater. He served in several notable assignments, including command of the XVI Corps during the Atlanta Campaign. He later commanded troops against Native Americans and served as a U.S. Wikipedia