Statistics for occurrence #1 of “U. S.A.” in chapter 97, page 503 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 5.:

...t; the right of the Forty-third joined the left of the Sixty-third, forming a right angle with it, and extending to Fort Williams, behind the crest of the ridge. The Eleventh Missouri, Col. Mower, ( U. S.A. ,) was formed behind the Sixty-third Ohio, its left in the angle, and the regiment faced obliquely to the right of the Sixty-third. The positions of these gallant regiments should be described, beca...
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