USS Portsmouth

The second USS Portsmouth was a wooden sloop-of-war in the United States Navy in service during the mid-to-late 19th century. She was designed by Josiah Barker on the lines of a French-built privateer, and built at the Portsmouth Navy Yard, directly across the Piscataqua River from Portsmouth, New Hampshire. She was described as an improvement over USS Saratoga built in the same shipyard a year earlier. Portsmouth was launched on 23 October 1843 and commissioned on 10 November 1844, with Commander John Berrien Montgomery in command.

Portsmouth had an important role during the Mexican–American War, seizing the port of Yerba Buena from Mexico. She had set sail on 25 January 1845 from Norfolk, Virginia, on a cruise around Cape Horn to join the Pacific Squadron under the command of Commodore John D. Sloat. En route, she made stops in Rio de Janeiro, Valparaiso, Callao, the Sandwich Islands, and Acapulco. Upon arriving off the Departamento de Las Californias coast, with Lieutenant Benjamin F. B. Hunter as her Sailing Master, she was initially engaged in watching the movements of British vessels there to prevent the possibility of Great Britain acquiring the region during any conflict between the U.S. and Mexico.

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