Nearly all standard histories of the US Civil War are defective because they don't write about the ongoing revolution in rifled and breach loading artillery and the application of those technologies to naval guns mounted on swivals and turrets.
@Rhea Cole highlighted the navy's struggle to mount heavy guns on shore to wreck Fort Pulaski. The events were the basis for General Lee concluding that it was nearly impossible for the Confederates to resist a determined naval assault. General Lee knew that rifled naval guns by 1861 fired on a flatter trajectory, with a higher velocity and had a higher hit rate. And the improvements never stopped.
By 1872, if a second war had ensued, the US would have mounted heavy breach loading guns on its naval vessels. Since the guns did not have to pivot over the deck to be mechanically loaded, the barrel could be of any length that was required. In that era, a naval vessel could sit 3,000 yards off shore and still destroy an onshore target. The navy would never dismount its big guns in that era, there would be no need to do so.