The regiment returned to New Hampshire to vote in the spring elections which were heavily contested. On March 16, 1864, the 14th N.H. departed for Louisiana to participate in the Red River Campaign, but arrived after it had ended. The regiment served at Camp Parapet, Carrollton, and Jefferson City until June 1864, when they returned to Virginia. The 14th served at Fortress Monroe and Berryville in Virginia until the end of July 1864. From August to December 1864, the regiment was part of General Sheridan's Army of the Shenandoah, and participated in the Third Battle of Winchester, on September 19, 1864, with heavy losses at the Battle of Fisher's Hill on September 22, 1864, and the Battle of Cedar Creek on October 19, 1864. Sergeant Major J. Henry Jenks, from Keene, New Hampshire, was the last man from this unit to fall in battle on October 19, 1864, in the Battle of Cedar Creek. At the conclusion of the Civil War, the 14th NH was stationed near Augusta and Savannah, Georgia. On July 8, 1865, the 14th New Hampshire Volunteer Regiment was mustered out in Savannah.