As the assault on Fort Gregg concluded, Turner's Third Brigade under Brigadier General Thomas M. Harris attacked Fort Whitworth, where Confederate Brigadier General Nathaniel Harris was in command. The defenders of Fort Whitworth had been shooting at the left and rear of the Union force gathered at the western fringes of Fort Gregg while the battle for that fort continued. Thomas Harris's troops fired into Fort Whitworth but did not try to storm it during the battle for Fort Gregg. Fort Whitworth fell soon after Fort Gregg was taken. As the battle for Fort Gregg was ending, Wilcox had ordered the defenders to retreat from Fort Whitworth. Only 69 or 70 Confederates were left to surrender by the time Brigadier General Thomas Harris's men finally charged Fort Whitworth and easily entered it, finding only two dead and two wounded Confederate soldiers with those who were left to surrender. About 15 other Confederate prisoners were taken outside the fort.