Statistics for occurrence #1 of “Commander Walke” in chapter 24 of Admiral David D. Porter, The Naval History of the Civil War.:

...a great expenditure of men and money, resulted in the capture of the strongest point of defence occupied by the enemy during the war. The expedition from Memphis got away early in December, 1862, Commander Walke , in the Carondelet, being sent ahead with the Cairo, Baron DeKalb, and Pittsburg. (iron-clads,) and the Signal and Marmora ( tin-clads ) to clear the Yazoo River of torpedoes and cover the landing...
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