The 11th Regiment, Vermont Volunteer Infantry or simply known as 11th VVI was a three-years infantry regiment in the Union Army during the American Civil War. It served in eastern theater, from September 1862 to August 1865. It served in the XXII Corps in the defenses of Washington D.C., and with the Vermont Brigade in VI Corps. The regiment was mustered into United States service on September 1, 1862 at Brattleboro, Vermont. On December 10, 1862, its designation changed to the 1st Vermont Heavy Artillery.[citation needed] It was engaged in, or present at: