Statistics for occurrence #1 of “U. S. A.” in chapter 5.32 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

...osition of things from our separate points of view, and he inquired anxiously after all his old friends. (General McClellan and my brother-in-law, General Dabney H. Maury, C. S. A., formerly captain, U. S. A. , had been classmates and devoted friends, and the general had visited my father's house and my own at Fredericksburg.) About 3 o'clock in the afternoon, looking down the road, we saw a carriage a...
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