The USS Corwin was a side wheel gunboat and wooden steamer built in Philadelphia, Pennsylvania, in 1849. Originally constructed for the United States Coast Survey, the vessel later transferred to the U.S. Revenue-Marine in April 1861 before being acquired by the Union Navy in September 1861 for Civil War service. Displacing approximately 330 long tons (340 tons), Corwin was armed with two medium 32-pounder guns and two 12-pounder guns, making her a modestly armed vessel suitable for patrol and survey duties. Corwin's primary role during the Civil War was to patrol navigable waterways of the Confederacy, aiming to prevent Southern trading with foreign nations. She was actively engaged in coastal surveillance along North Carolina, notably conducting surveys of the coast. She played a significant role in repelling Confederate and blockade runner threats; on November 14, 1861, Corwin successfully repulsed an attack by the CSS Curlew at Hatteras Inlet, an important estuarine area. She continued her patrol duties in the region, and on July 22, 1865, she rendered assistance to the steamer Quinnebaug, which had run aground off Beaufort, North Carolina. In July 1862, Corwin joined the North Atlantic Blockading Squadron, operating in Hampton Roads and nearby waters, before being detached in July 1862 for survey work along the Potomac River. Her service was characterized by her versatility—serving both as a patrol vessel and a survey ship. After the conclusion of the Civil War, Corwin was returned to the U.S. Coast Survey, resuming her peacetime role under the Treasury Department. Her service record highlights her importance in coastal defense, survey operations, and maritime patrol during a pivotal period in American history.

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