Mississippi valley. Braving the fire of skillfully used Vicksburg cannons, Porter's flotilla peppered the Southern emplacements with shell, grape, and shrapnel throughout the daring dash. During the fray John P. Jackson was hit twice by 7-inch rifle projectiles, leaving her without power and causing other serious damage. Moments later Clifton, coming to her aid with a towline, was struck in her starboard boiler; seven men were killed by scalding steam. John P. Jackson quickly lowered her boats to save a number of other men who had been forced overboard by the steam. Continued blockade operations After repairs at New Orleans, John P. Jackson was ordered to Mississippi Sound on 30 September for reconnaissance work; and she served there throughout the remainder of the war. Fire broke out in her engineering spaces on 8 October, but efficient and courageous damage control action extinguished the blaze and saved the ship. She captured sloop Young Gustave in Mississippi Sound on 21 October, and diligently performed blockade duty in the months that followed. On 12 September 1863 she cooperated with Genesee and Calhoun in chasing steamer Fanny ashore where she was burned to prevent her falling into Union hands. The next day the same team engaged Confederate steamer Jeff Davis, forcing her to withdraw to the shelter of batteries at Grant's Pass. The Union vessels then silenced the Grant's Pass guns. John P. Jackson overhauled and took schooner Syrena bound from Biloxi, Mississippi, to Pascagoula, Mississippi, on 21 October. Bombardment of Fort Powell Admiral Farragut's next major objective was Mobile Bay. John P. Jackson was on hand at the outset of the campaign on 16 February 1864 when she towed three schooners into position for the bombardment of Fort Powell and then joined in the cannonade. For the next six months she operated from New Orleans supporting the operations which culminated on 5 August in Admiral Farragut's stirring victory. John P. Jackson captured the schooner Medora in Mississippi Sound on 8 December 1864, and continued to serve in the West Gulf Blockading Squadron until after the end of the war. Post-war decommissioning and sale She departed Pensacola Navy Yard on 26 July 1865 and two days later arrived New Orleans, where she decommissioned 5 September. She was sold at public auction in New Orleans to Marcy, Maury & Co. on 27 September 1865. She was renamed J. P. Jackson on 3 October 1865 and