Statistics for occurrence #1 of “Washington, N. C.” in chapter 85 of Thomas Wentworth Higginson, Massachusetts in the Army and Navy during the war of 1861-1865, vol. 1, Condensed history of regiments.:

... Three companies were sent to Washington again in May; and the remainder of the regiment, moving there in June, met the enemy at Tranters Creek June 5; two companies again serving on detached duty at Washington, N. C. , from July 8 to September 12, took part with loss in the engagement on September 6. The first of November the regiment, with the exception of two companies, left on picket at New Berne, took part...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
Washington, N. C. (North Carolina, United States) 82 11 82 11 0 user votes
Washington, N. C. (North Carolina, United States) 8 2 8 2 0 user votes
Washington, N. C. (North Carolina, United States) 0 0 0 0 0 user votes

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