Statistics for occurrence #1 of “Drewry's” in chapter 15 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 5: Forts and Artillery.:

...several ship's guns were also mounted to cover the obstructions in the channel. On May 15th, a fleet of Union gunboats under Commander John Rodgers ascended the James and engaged the batteries at Drewry's Bluff. The seven heavy guns now on the works proved most effective against the fleet. After an engagement of four hours the vessels withdrew, considerably damaged. From information then in th...
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