Union Navy
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The Union Navy was the United States Navy (USN) during the American Civil War, when it fought the Confederate States Navy (CSN). The term is sometimes used carelessly to include vessels of war used on the rivers of the interior while they were under the control of the United States Army, also called the Union Army.
USS Conestoga, a converted gunboat that served on the Mississippi River.
Part of the crew of USS Monitor, after her encounter with CSS Virginia (ex-USS Merrimack)
Crewmen of USS Lehigh in 1864 or 1865.
"The Splendid Naval Triumph on the Mississippi, April 24th, 1862" (Currier and Ives lithograph)
John A. Dahlgren
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John Adolphus Bernard Dahlgren was a United States Navy officer who founded his service's Ordnance Department and launched significant advances in gunnery.
Rear Admiral Dahlgren, on board the USS Pawnee, beside a 50-pounder Dahlgren rifle, one of his bottle-shaped cast-iron cannons, c. 1864
Dahlgren during the American Civil War
Dahlgren's tombstone in Laurel Hill Cemetery in Bala Cynwyd, Pennsylvania