http://www.arlingtoncemetery.net/hhmarmaduke.htm

Henry Hungerford Marmaduke served in the Confederate Navy. He commanded a gun crew of 14 men on board the ironclad CSS Virginia (aka, CSS Merrimac) during it's historic battle with the ironclad USS Monitor in Hampton Roads, Virginia.

http://en.wikipedia.org/wiki/CSS_Virginia

He was later captured and imprisoned on Johnson's Island.

After the Civil War, he served the U.S. federal government in negotiations with South American nations and commanded a ship in the Columbian Navy.

He is buried in Arlington National Cemetery.