Statistics for occurrence #1 of “U. S.” in chapter 118 of Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 5.:

...commanding forces at Vicksburgh, herewith enclosed. Respectfully, James L. Autry, Military Governor and Commandant Post. headquarters defences Vicksburgh, Miss., May 18, 1862. S. Phillips Lee, U. S. N., Commanding Advance Naval Division: sir: Your communication of this date, addressed To the authorities of Vicksburgh, demanding the surrender of the city and its defences, has been received. ...
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