The USS Porpoise was a 224-ton Dolphin-class brigantine, later re-rigged as a brig, built in 1835 and launched on May 31, 1836. She was constructed based on the same plans as the Dolphin and was authorized by Congress on June 30, 1834. Under the command of Lieutenant William Ramsay, she embarked on her maiden voyage from Boston on August 25, 1836, and conducted coastal surveying along southern ports under Lieutenant Charles Wilkes in 1837. In October of that year, she engaged in anti-piracy operations along the southern coast before resuming her surveying missions. Porpoise played a significant role in the United States Exploring Expedition, commanded by Lt. Cadwalader Ringgold. She departed Hampton Roads on August 18, 1838, as part of this squadron, which aimed to explore and survey vast areas of the Pacific, confirm the existence of the Antarctic continent, and circumnavigate the globe. During this expedition, she contributed to important discoveries and charted extensive regions, returning in 1842. In 1841, the vessel visited the French Frigate Shoals and Vostok Island, making the first recorded landing attempt on Vostok. After an overhaul in New York at the end of 1842, she joined the West Africa squadron in 1843 to patrol against the slave trade, returning to New York in November 1844. During the Mexican-American War (1845–1847), Porpoise cruised in the Gulf of Mexico, participating in operations against Tampico, Pánuco, and Veracruz. She then continued her anti-slavery patrols along the West African coast until her return to New York in December 1851. Recommissioned in 1853, Porpoise joined Commander Ringgold's North Pacific Exploring and Surveying Expedition. She explored Pacific islands and shoals en route to China, where she conducted further surveys around the Bonins, the Ladrones, and the Marianas. After parting from the squadron near Formosa in September 1854, she was never heard from again, most likely having foundered during a heavy typhoon shortly after her separation. Her service record highlights her importance in early American naval exploration, surveying, and anti-slavery operations.

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