The USS Seneca was a Unadilla-class gunboat constructed for the United States Navy during the Civil War era. Built in New York City by Jeremiah Simonson, she was launched on August 27, 1861, and commissioned at the New York Navy Yard on October 14, 1861, with Lieutenant Daniel Ammen commanding. As a "Ninety-day gunboat," Seneca was designed for rapid deployment and was armed with guns capable of horizontal fire, complemented by two howitzers for shore bombardment. She had a crew complement of 84 officers and men, and her primary mission was to enforce the Union blockade of Confederate ports. Early in her service, Seneca participated in a significant engagement near Port Royal, South Carolina, on November 5, 1861, helping to disperse a Confederate squadron. She played a key role in the capture of Port Royal two days later, which became a vital Union naval base throughout the war. Subsequently, she was involved in expeditions to take possession of Beaufort, South Carolina, and operations around Tybee Sound to block Savannah, Georgia. Throughout 1862 and early 1863, Seneca's operations extended from Wilmington, North Carolina, to Florida. Notably, she participated in attacks on Fort McAllister in late January and early February 1863, and supported USS Montauk in destroying the privateer Rattlesnake in February. In July 1863, she was involved in the attack on Fort Wagner. She was decommissioned at New York Navy Yard in January 1864 but was recommissioned in October of the same year under Commander George Belknap, serving in the North Atlantic Blockading Squadron. Seneca's most notable actions occurred in late 1864 and early 1865, during the campaigns against Fort Fisher, a Confederate stronghold guarding Wilmington, North Carolina. She participated in the unsuccessful first attack in December 1864 and the successful second assault in January 1865, which resulted in the capture of Fort Fisher and effectively sealed off Wilmington. Chief Boatswain's Mate Othniel Tripp was awarded the Medal of Honor for his heroism during this operation. The vessel also took part in the attack and capture of Fort Anderson in February 1865. After the war's end, Seneca returned to Norfolk, Virginia, and was decommissioned on June 24, 1865. She was sold on September 10, 1868, to Purvis and Company, marking the end of her service.

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