Statistics for occurrence #1 of “Rear-Admiral Dahlgren” in chapter 50 of Admiral David D. Porter, The Naval History of the Civil War.:

...s off Charleston bar, two Monitors were at Edisto, one at Stono River, three at Port-Royal, and one at Ossabaw. General Gillmore having arrived. arrangements were immediately made between him and Rear-Admiral Dahlgren for a descent on Morris Island, where the former was to establish his batteries. The naval part of the operations consisted in assembling all the Monitors at Charleston, so as to cross the bar at...
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