Grenville Mellen Dodge (April 12,1831--January 3,1916) was a Union army officer on the frontier and during the Civil War, a U.S. Congressman, businessman, and railroad executive who helped direct the construction of the Transcontinental Railroad.
Grenville Mellen Dodge (April 12,1831--January 3,1916) was a Union army officer on the frontier and pioneering figure in military intelligence during the Civil War, where served as Ulysses S. Grant's intelligence Chief in the Western Theater. He later served as a U.S. Congressman, businessman, and railroad executive who helped direct the construction of the Transcontinental Railroad.