Statistics for occurrence #1 of “Admiral Porter” in chapter 5 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 4: The Cavalry:

...to carry out his maneuver of crossing the Mississippi at Grand Gulf and advance upon Vicksburg from the south, that Pemberton's attention should be distracted in other directions. The morning after Admiral Porter ran the batteries, Grierson left La Grange, Tennessee, to penetrate the heart of the Confederacy, sweeping entirely through Mississippi from north to south, and reaching Baton Rouge on May 2d. Exag...
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