JEB Stuart rode around Hookers, then Meades, army on the 28th and 29th of June, 1863, operating under specific instructions received in a letter dated June 23 from General Lee. The letter, written in the hand of Walter Taylor, one of Lees aides, is recorded at page 23 of the Gettysburg Letterbook. Lees instructions were:
||You will be able to judge whether you can move around their army without hindrance, doing all the damage you can and cross the river east of the mountains. . . after crossing the river you must move on and feel the right of Ewell (Early at York), collecting information, provisions, etc.
Stuart followed Lees instructions fairly well. With three cavalry brigades (Fitz Lees, Rooney Lees, and Wade Hamptons), he crossed the Potomac the night of the 27th near Dranesville, passed through Rockville early on the morning of the 28th, capturing there a 125 wagon supply train heading for the Union army, and moved north toward Westminister, Meades selected base of operations, destroying telegraph lines. This forced Washington to communicate with Meade by courier, delaying considerably the time in which intelligence of rebel movements reached Meades headquarters at Middleburg. At Hoods Mill, Stuart sent his brigades east and west along the line of the Baltimore & Ohio Railroad, destroying bridges. The night of the 28th, he scouted west, encountering the movement of the Union 2nd and 5th corps which were heading northeast toward Westminister and Union Mills. The morning of the 29th, Stuart entered Westminister, skirmishing with a Union cavalry detachment, scattering it and chasing it some distance toward Baltimore. Stuart spent the night of the 29th at Union Mills, with the Union 5th and 6th corps approaching. The morning of the 30th, after waiting for Kilpatricks cavalry division to pass his front in the direction of Hanover, Stuart followed and struck Kilpatricks rear in the streets of Hanover, diverting Kilpatrick from the purpose of his mission, locating the whereabouts of the rebel force known to be at York and Wrightsville. Breaking off the engagement in the afternoon, Stuart, with his captured train and prisoners, passed around York and headed northwest through Dover and Dillsburg, reaching Carlisle on July 1.
Though Stuart did not actually open direct communication with Earlys division, he certainly felt Earlys presence, which explains his attack on Kilpatricks rear. Stuart knew that Early was at York on the 29th, that he would be moving west to join Ewell, as that was Lees plan as explained to him when he met with Lee at Paris, Fauquier County, on June 22. Indeed, Whites cavalry, operating with Early, had been to Hanover, burning railroad bridges, on the 29th, and Stuarts pickets and scouts certainly came very close to contacting Earlys cavalry squadrons that were roaming the country around Hanover.
As explained in The Gettysburg Letterbook, the controversy that developed over Stuarts ride around Hooker was created, in large measure, by Charles Marshall, aide de camp to Lee, who claimed responsibility for drafting the text of Lees official Jan 1863 operations report. In the report, Lee constructed a story to support his public position that, when he entered Pennsylvania, he did not intend to draw the Union army into a general battle at Gettysburg; instead, the report says, he intended to move on Harrisburg, by way of Carlisle and the Wrightsville bridge, but, because he was operating without the benefit of reconnaissance reports from Stuart, he was forced by circumstance (the illusory threat of the Union army moving west of South Mountain) to move his army east of the mountains, which brought it unexpectedly upon Meades advance at Gettysburg. After the war was over, Marshall pushed this story in an address he made on the occasion of Lees birthday in 1896, and it was repeated by Frederick Maurice in the book, Charles Marshall, Aide de Camp to General Lee, published in 1925. It has been adopted by most civil war writers without questioning either Marshalls credibility, or his veracity. In fact, Lee knew all he needed to know of the movement of the Union army, during June 27-July1, based upon the paramount principle of concentration both he and the Union army commander were constrainted by the realities of warfare to obey.
Certainly Stuarts cavalry could make no contribution to the battle itself, for cavalry had no place on a Civil War battlefield: The horsemen charging around would be wiped out quickly by the massed infantry fire of the long range rifles available, their range extending 1,000 yards, accurate fire at 700 to 800 yards. Cavalry stands on the sidelines when the King of Battle (infantry) is at work. The cavalry of both sides did collide in a separate battle on July 3rd, some three miles from the battlefield at Gettysburg, but it added no advantage to the scales of victory for either side.
John S. Mosby, Stuarts Cavalry in the Gettysburg Campaign, Moffat, Yard & Co. 1908
Frederic Shriver Klein, Just South of Gettysburg, Newman Press, 1963
Edward G. Longacre, The Cavalry at Gettysburg, Fairleigh Dickinson University Press, 1986
Mark Nesbitt, JEB Stuart and the Gettysburg Controversy, Stackpole Books, 1994
Historical Publication Committee, Encounter at Hanover: Prelude to Gettysburg, 1963