Statistics for occurrence #1 of “Jamestown Island” in chapter 36 of Admiral David D. Porter, The Naval History of the Civil War.:

...one 12 and one 24-pound howitzer. Stepping Stones (light ferry-boat),with a battery of howitzers. The Commodore Barney, Lieutenant W. B. Cushing, was also detached from other duty and sent to Jamestown Island . The above list of vessels will show to what shifts the Navy was put to meet the calls made upon it by the Army. Gun-boats were called for everywhere, and these demands were more than the ...
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Entity Corpus Doc Corpus Doc  
Jamestown Island (Virginia, United States) 87 4 1 0 0 user votes

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