Statistics for occurrence #1 of “Fort Walker” in chapter 34 of Admiral David D. Porter, The Naval History of the Civil War.:

... to follow the motions of the Commander-in-chief. Standing to the northward, nearly in the line shown in the diagram, the ship's head was again turned to the southward, and she passed the guns of Fort Walker at a distance less than six hundred yards (the sights were adjusted to five hundred and fifty yards). At 11h. 30m. the enemy's flag was shot away. The second fire with the starboard guns of the W...
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