Statistics for occurrence #1 of “Forts Donelson” in chapter 25 of Admiral David D. Porter, The Naval History of the Civil War.:

...moothly, there were no mistakes made, and the officers and seamen gained confidence in the gun-boats which they lacked before. But these had been much strengthened and improved since the battles of Forts Donelson and Henry, and had entire new guns on them instead of the inferior batteries they started out with; moreover, the officers had learned that the way to fight these batteries was at close quarters. ...
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