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'USS ''Merrimack''' was a screw frigate of the United States Navy, best known as the hulk upon which CSS ''Virginia'' was built during the American Civil War and then took part in the Battle of Hampton Roads (often called "the Battle of the ''Monitor'' and the ''Merrimack''").
''Merrimack'' was launched by the Boston Navy Yard 15 June 1855; sponsored by Miss Mary E. Simmons; and commissioned 20 February 1856, Captain Garrett J. Pendergrast in command.
She was the second ship of the Navy to be named for the Merrimack River, which is formed by the junction of the Pemigewasset and Winnipesaukee Rivers at Franklin, New Hampshire. The Merrimack flows south across New Hampshire, and then eastward across northeastern Massachusetts before emptying in the Atlantic at Newburyport, Massachusetts.
Shakedown took the new screw frigate to the Caribbean and to western Europe. ''Merrimack'' visited Southampton, Brest, Lisbon, and Toulon before returning to Boston and decommissioning 22 April 1857 for repairs. Recommissioning 1 September 1857, ''Merrimack'' got underway from Boston Harbor 17 October as flagship for the Pacific Squadron. She rounded Cape Horn and cruised the Pacific coast of South and Central America until heading for home 14 November 1859. Upon returning to Norfolk, she decommissioned 16 February 1860.

''Merrimack'' was still in ordinary during the crisis preceding Lincoln's inauguration. Soon after becoming Secretary of the Navy, Gideon Welles took action to prepare the frigate for sea, planning to move her to Philadelphia. The day before the firing on Fort Sumter, Welles directed that "great vigilance be exercised in guarding and protecting"; Norfolk Navy Yard and her ships. On the afternoon of 17 April, the day Virginia seceded, Engineer in Chief B. F. Isherwood managed to get the frigate's engines lit off; but the previous night secessionists had sunk lightboats in the channel between Craney Island and Sewell's Point, blocking ''Merrimack''. On the 20th, before evacuating the Navy Yard, the U.S. Navy burned ''Merrimack'' to the waterline and sank her to preclude capture.
The Confederates, in desperate need of ships, raised ''Merrimack'' and rebuilt her as an ironclad ram, according to a design prepared by Lt. J. M. Brooke, CSN. Commissioned as CSS ''Virginia'' 17 February 1862, the ironclad was the hope of the Confederacy to destroy the wooden ships in Hampton Roads and to end the Union blockade which had already seriously "crippled" the South.

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External links

★ history.navy.mil/danfs: USS ''Merrimack''

★ history.navy.mil/photos: USS ''Merrimack''