Statistics for occurrence #1 of “U. S. A.” in chapter 1, page 23 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 2.:

...positions by my senior staff officer, up to the time when Col. Heintzelman ordered the cavalry to the front of the column. Very respectfully, your obedient servant, A. Porter, Col. 16th Regt., U. S. A. , Commanding. camp near Arlington, Va., July 25, 1861. Col. A. Porter, Commanding Second Brigade: Colonel: In compliance with your instructions, I have the honor to report that Battery...
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