Statistics for occurrence #1 of “General Butler” in chapter 40 of Admiral David D. Porter, The Naval History of the Civil War.:

...el, along the right bank, was sunk a large schooner loaded with stone, from which a strong boom extended to the shore. The obstructions were very complete, and were intended to be under the fire of General Butler 's guns as well as those of the iron-clads. The enemy probably was well pleased at the Federals obstructing the channel; for, notwithstanding his forts at Howlett's and Drury's Bluff, his fire-raf...
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