2nd New Hampshire Volunteer Regiment was the longest-serving volunteer regiment of the State of New Hampshire in the American Civil War. The 2nd New Hampshire was organized in early 1861 and mustered in June 4, 1861. The 2nd NH fought from First Bull Run until the occupation of Richmond approximately four years later. The regiment was led by Colonel Gilman Marston, a future United States congressman who represented the state in the 51st Congress (1889-1891).