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

...ever would have been taken if it had depended on General McClernand's raising an Army sufficient for the purpose, the admiral, immediately on his arrival at Cairo, sent a message to General Grant, at Holly Springs, Miss. , informing him of McClernand's intention, that he, Porter, had assumed command of the Mississippi Squadron, and was ready to cooperate with the Army on every occasion where the services of the Navy c...
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