received a shocking piece of intelligence at his headquarters near Chambersburg, Pennsylvania. Th e Federal Army of the Potomac, now under the command of Maj. Gen. George G. Meade, was north of its namesake river in the vicinity of Frederick, Maryland, instead of south of it as Lee had assumed. Worse, Lee had received that information from a Brig. Gen. James Ewell Brown "Jeb" Stuart commanded the cavalry of the Army of Northern Virginia. Courtesy of the National Archives and Records Administration.2 Longstreet's First Corps now comprised the divisions of Maj. Gens. Lafayette McLaws, John B. Hood, and George E. Pickett. Ewell's Second Corps included the divisions of Maj. Gens. Jubal A. Early, Robert E. Rodes, and Edward Johnson. Hill's Th ird Corps contained divisions commanded by Maj. Gen.s
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