Statistics for occurrence #1 of “General Butler” in chapter 16.106 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War. Volume 4.:

...ance of the river as a base of operations and means of communication, General Grant had determined that he would not take the chances of a naval contest for its control, and he had previously ordered General Butler to procure and sink a number of hulks in the channel at Trent's Reach. The obstructions were put in position between the 15th and 18th of June, and the operations of the fleet for the remainder of ...
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