He was stricken with yellow fever and died in 1862!
(1809-1862) Graduated in the West Point class of 1829. In the next 7 years he served as an instructor at the United States Military Academy, studied law, was admitted to the bar, resigned from the army, and became a member of the faculty of Cincinnati College where he taught astronomy, philosophy and mathematics. It was as a dedicated student of astronomy that Mitchel gained his claim to fame. He was largely responsible for establishing the Naval Observatory, the Harvard Observatory, the Cincinnati Observatory, and the Dudley Observatory. On August 9, 1861, President Lincoln appointed him a brigadier general of volunteers and he was assigned as commander of the Department of the Ohio. In March 1862, he seized the Memphis and Charleston Railroad at Huntsville, Alabama, and sent raiding parties into Stevenson and Decatur to secure the tracks for the Union army. He was promoted to major general on April 11, 1862. He then commanded the Department of the South and was stricken with yellow fever and died at Beaufort, S.C., on October 30, 1862.
Wet plate, albumen carte de visite photograph, mounted to 2 3/8 x 4 card. Seated view in uniform with rank of major general, posing with his arms folded across his chest and wearing his gauntlets. Backmark: E. & H.T. Anthony, New York, made from a photographic negative in Brady's National Portrait Gallery. Pencil inscription on the reverse, "Maj. Gen. Mitchell, deceased." Very sharp image. Scarce view. Very desirable photograph.