sentences:  Low water levels in the Red River prevented the "Missouri" from participating in the defense of western Louisiana when the army of Union General Nathaniel P. Banks and the fleet of Admiral David Dixon Porter advanced on Shreveport in April 1864.In March 1865, the Red River rose sufficiently to permit Carter to take the "Missouri" downstream to Alexandria, the seat of Rapides Parish in central Louisiana, where the gunboat, officers, and crew surrendered to the United States Navy on June 3, 1865, nearly two months after Robert E. Lee signed the surrender at Appomattox Court House, Virginia.Carter was promoted to the rank of Captain some two weeks before the war ended.