CDV of Rear Admiral John Dahlgren by Brady and Anthony

CDV of Rear Admiral John Dahlgren by Brady and Anthony.
 
John Adolphus Dahlgren (1809 – 1870 ) Famous Civil War Ordnance Admiral & INVENTOR OF THE DAHLGREN GUN FOR NAVAL SHIPS!! Under Dahlgren's direction, the United States Navy establishedits own foundry to manufacture new equipment, and today he is best known for developing a cast-iron gun called a Dahlgren, which became a standard armament on navy ships after 1856. In 1861, when Dahlgren's commander resigned to join the Confederate Navy, President Lincoln placed him in charge of the Washington Navy Yard. On requesting active service, Dahlgren took command of the South Atlantic Blockading Squadron in July 1863, secured Charleston's harbor, and aided Sherman's capture of Savannah in 1864. Brady's photographers made a series of portraits of Dahlgren and his crew aboard the U.S.S. Pawnee in Charleston harbor.