The Battle of Grand Gulf was fought on April 29, 1863, during th: Confederate fire had focused the heaviest on Benton, Pittsburgh, and Tuscumbia.[41] The former vessel had taken 47 hits, Pittsburgh 35, and the latter over 80.[47] Tuscumbia was poorly built (for instance, the spikes holding the ship's iron plating on were not secured with nuts), and had been badly damaged and knocked out of the fighting[48] by engine damage.[49] Historians Michael B. Ballard and Ed Bearss state that the Union forces lost 18 men killed and 57 wounded, for a total of 75,[44][50] with historians William L. Shea and Terrence J. Winschel, along with the historian Timothy B. Smith instead placing Union casualties at 24 killed and 56 wounded, including a few men from the army serving on the warships in a volunteer capacity.[46][51]  According to Ballard and Bearss, Confederate losses totaled 22: three dead and 19 wounded;[44][52]  historian Donald L. Miller and Shea and Winschel state that the Confederates lost 18 men, the difference being in wounded.[53][46]