Statistics for occurrence #1 of “Admiral Dahlgren” in chapter 32 of Admiral David D. Porter, The Naval History of the Civil War.:

...its kind in the world — we refer to the 11-inch and 9-inch smooth-bore — rifled cannon had not at that time made such an advance as to satisfy us that it would be the gun of the future. Admiral Dahlgren , who had brought our naval ordnance to a state of perfection, considered the 11-inch the most powerful gun in the world; and having accomplished what he considered the grandest feat of gun-making in ...
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