Statistics for occurrence #1 of “Dr. Crawford” in chapter 3.7 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: The Opening Battles. Volume 1.:

...mate guns bearing on Morris Island; the second, under Lieutenant Jefferson C. Davis; manned the casemate guns bearing on the James Island batteries; and the third-without a commissioned officer until Dr. Crawford joined it — was marched by a sergeant to the guns bearing on Sullivan's Island. The guns in the lower tier, which were the only ones used during the bombardment,--except surreptitiously wit...
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