USS Niphon was a steam operated vessel acquired by the Union Navy during the American Civil War. She was used by the Navy to patrol navigable waterways of the Confederacy to prevent the South from trading with other countries.

USS Malvern was a large steamer captured by the Union Navy during the American Civil War. She was then used by the Union Navy to patrol navigable waterways of the Confederacy to prevent the South from trading with other countries.