Statistics for occurrence #1 of “Doc” in year 1863, month April, day 14 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:
...a. between the United States gunboats Commodore Barney, Mount Washington, and Stepping Stones, and a powerful rebel shore battery, in which, after a four hours bombardment, the latter was silenced.--( Doc . 168.)
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