Statistics for occurrence #1 of “Admiral Dahlgren” in chapter 55 of Admiral David D. Porter, The Naval History of the Civil War.:

...an hour afterwards two batteries of naval howitzers and nine companies of seamen and marines were landed under Commander Preble, and advanced in skirmishing order, to cover the landing of the troops, Admiral Dahlgren returning to his duty afloat. After General Foster had landed all his soldiers, an advance was made towards the railroad above Grahamsville. The Confederates had assembled in considerable force...
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