Statistics for occurrence #1 of “Mo.” in year 1861, month June, day 3 of Rebellion Record: a Diary of American Events, Diary from December 17, 1860 - April 30, 1864:

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Quartermaster T. Bailey Myers arrived at New York from Fortress Mo. roe, bringing from that quarter a secession flag as a present to the Union Defence Committee. The flag was captured at Hampton village, near the fort, and when taken was flying from its staff on the...
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