The USS Grampus was a schooner constructed at the Washington Navy Yard, launched in early August 1821, with a keel length of 73 feet (22 meters). Designed under the supervision of naval constructor William Doughty and based on a plan by Henry Eckford, she represented the largest vessel in a fleet of five schooners built as part of the U.S. Navy’s efforts to combat piracy and slaving activities following the War of 1812. Her construction marked the Navy’s first post-war building program. Throughout her service, USS Grampus played a role in maritime patrols in the Caribbean and the South Atlantic. Under the command of Lieutenant Francis Gregory, she participated in the West Indies Squadron, where her missions included convoying merchant ships and suppressing piracy. Notably, in August 1822, she engaged and captured a brig suspected of piracy, which was later identified as Palmyra, a privateer from Puerto Rico. The vessel, believed to be the privateer Panchetta, was armed with 18 guns and had a crew of 92, suffering 11 fatalities in the confrontation. In 1825, under Captain John D. Sloat, Grampus was involved in capturing the Puerto Rican pirate Roberto Cofresí and his crew, who were handed over to Spanish authorities in San Juan. She also had a minor role in the Amistad trials of 1839, standing by in New Haven Harbor to potentially deport the Africans if the court's decision favored the slaveholders, though she was ultimately not needed. Remaining active in protecting shipping routes, USS Grampus continued her operations until August 1841, after which she was detached from the Africa Squadron. By January 1843, she was assigned to the Home Squadron at Norfolk, Virginia. Her final known communication was near St. Augustine, Florida, in March 1843. She is presumed to have foundered with all hands during a gale off Charleston, South Carolina, near the end of her service life.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.