Statistics for occurrence #1 of “Frederick, Maryland” in chapter 16 of The Annals of the Civil War Written by Leading Participants North and South:

...llowed Ewell, who had already advanced into Pennsylvania as far as Chambersburg. The Army of the Potomac crossed on the 25th and 26th, at Edwards' Ferry, and was concentrated in the neighborhood of Frederick, Maryland . It was under these circumstances that, at two A. M. of June 28th, General Meade, still in command of the Fifth Corps, received from General Hardie, of the War Department, the order of the Presi...
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