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John A. Dahlgren. Courtesy of the Library of Congress (LC-B8172-1862).


Dahlgren, John Adolphus Bernard (13 November 1809–12 July 1870), naval officer, was born in Philadelphia, Pennsylvania, the son of Bernard Ulric Dahlgren, a merchant and diplomat, and Martha Rowan. Dahlgren received his early education at a Quaker school in Philadelphia. Because of his father’s position as Swedish consul, the Dahlgrens were a well recognized and respected family. When the elder Dahlgren died suddenly in 1824, the family was left in financial difficulty. Though initially denied entrance, thanks to family connections in February 1826 Dahlgren was granted an appointment as a midshipman in the U.S. Navy. His first assignment was to the frigate ...