CSS Isondiga was a small wooden gunboat without masts which operated in waters around Savannah, Ga., and in St. Augustine Creek, Fla., from April 1863 to December 1864, Lt. J. S. Kennard commanding. She accompanied ironclad ram Atlanta in the engagement in which Attack was captured 17 June 1863.

She escaped from Savannah on 21 December 1864 before the city fell to the forces of Gen. W. T. Sherman. She was later burned by her commanding officer and crew to prevent seizure by the Union