Statistics for occurrence #1 of “Rear-Admiral Dahlgren” in chapter 39 of Admiral David D. Porter, The Naval History of the Civil War.:

... and the insufficiency of his force of vessels, DuPont very properly withdrew. The wisdom of his course was subsequently shown during the combined Army and Navy operations against Charleston, under Rear-Admiral Dahlgren and Brigadier-General Gillmore. On the later occasion, sixty siege-guns were brought to bear on the enemy, and Fort Sumter was reduced to pulp, yet the difficulties of an advance of the naval vess...
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