Statistics for occurrence #1 of “Fort Moultrie” in chapter 50 of Admiral David D. Porter, The Naval History of the Civil War.:
...onitors Lehigh and Patapsco were ordered to take positions at a distance of from 1,600 to 2,000 yards of the fort, and open fire upon it with their rifled guns.
These vessels were within range of Fort Moultrie for some time, but suffered little damage, while their rifle projectiles told on the walls of Fort Sumter with considerable effect.
Large masses of masonry were displaced, heavy timbers thrown into...
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