Dua Ningo was an elder Sullustan male serving as an admiral in the navy of the Confederacy of Independent Systems. Approximately two years into the Clone Wars, Ningo took command of the Bulwark Fleet, an armada of Bulwark Mark I warships stationed at the shipyards above the Core World of Foerost. After breaking the Galactic Republic's blockade of the planet, the Sullustan used the Bulwark Fleet to wipe out many Republic outposts in Sector Zero as he moved to conquer the Republic capital of Coruscant.