Yep, from land. They landed on Tybee Island and proceeded to pound the fort from across the river. About a mile.  They had plenty of time to dig in and establish their gun platforms. 

Here is a thought. Cockspur lighthouse is directly in the trajectory path of the shelling. They did not hit it once either on accident of out of malice. I don't know but they might have used it as a marker for aim since it was a fixed point directly in the line of fire. You know where you are, where the lighthouse is, and where the fort is. With three established points lining up a shot would seem pretty basic.         

Rifled artillery technology is not my area of expertice. Another thing to study this summer. Take a look at the historic photos and you will get a pretty good idea of the accuracy. I know one thing, lime mortar/natural cement or whatever does not hold up well to a good artillery pounding. 

Brian        

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