Statistics for occurrence #1 of “Confederate States” in chapter 1.30 of Southern Historical Society Papers, Volume 29.:

... Foundation—What General Grant wrote about the matter. The following correspondence between Mr. Spotswood Bird, of Baltimore, a member of Company F, Twenty-fourth Regiment Virginia Cavalry, Confederate States Army, and Colonel Charles Marshall, of this city, corrects a frequently-repeated misstatement connected with General Lee's surrender to General Grant at Appomattox. The correspondence was elicited...
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