The USS Agassiz was a vessel originally part of the United States Coast Survey before being borrowed by the Union Navy during the American Civil War. Serving primarily as a gunboat, she played a supporting role in the Union blockade of Confederate waterways. Although specific details about her size and construction are not provided, her operational history indicates that she was a versatile and active vessel engaged in key military and survey duties. Initially, Agassiz served as a receiving ship in New York Harbor after her transfer to the Revenue Cutter Service. By December 1861, she was stationed at Sag Harbor, Long Island, before moving to New London, Connecticut, in June 1862. Her service took her southward in December 1862, when she was assigned to the sounds of North Carolina. Arriving at New Bern in January 1863, she supported Union Army troops and naval forces along the treacherous North Carolina coast into the summer. A notable event in her service occurred on the night of 13-14 March 1863, when Agassiz aided in repelling a significant Confederate attack against Fort Anderson on the Neuse River. During this engagement, she assisted Union gunboats USS Hunchback, USS Hetzel, USS Ceres, and USS Shawsheen. Her contribution was praised by Commander Alexander Murray for her efficient service and the bravery of her crew, particularly Lieutenant Commanding Robert H. Travers. Following repairs at Norfolk Navy Yard due to damage sustained during the battle, Agassiz returned north, arriving at New Bedford, Massachusetts, in July 1863. She continued to serve in the northern waters through the end of the war, relocating to Newport, Rhode Island, in October 1865, before being transferred back to the U.S. Coast Survey at New York City at the end of that year. Her service underscores her significance as a versatile vessel contributing to both military operations and survey missions during the Civil War period.

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