Mattabesett departed New York on April 21, 1864, for duty in the North Atlantic Blockading Squadron and arrived at Hampton Roads on April 23 as escort to . Continuing down the coast to enter the North Carolina Sounds, she took part in an engagement between Union forces and the Confederate ram CSS Albemarle, accompanied by CSS Bombshell and CSS Cotton Plant, off the mouth of the Roanoke River on May 5. In the course of the battle, leading to the capture of Plymouth, North Carolina by Confederate forces, Mattabesett, with, captured Bombshell, but Albemarle and Cotton Plant escaped.
But for a brief trip to New York in the fall of 1864, Mattabesett continued to serve the North Atlantic Blockading Squadron for the remainder of the U.S. Civil War, operating primarily in the inland waters of North Carolina. She sailed north in May 1865, decommissioned at New York on May 31, and was sold there on October 15.
Ships captured in the American Civil War