I have just finished Edward G. Longacre's "The Cavalry at Gettysburg: A Tactical Study of Mounted Operations during the Civil War's Pivotal Campaign, 9 June - 14 July 1863." The work seems to be well researched and thoroughly documented. Is this a recommended work? I live just east of Gettysburg, and can vouch for the challenges Stuart faced in the undulating terrain of the area. Of particular interest to me is the all night march on the night of June 30 - July 1. After spending the day fighting in south Hanover (with Kilpatrick, Farnsworth, and (yes) Custer), Stuart slides east and north as darkness sets in. The route taken was over to Marburg (now flooded under Codorus State Park) then NNE up to Jefferson, a turn to the NW to Spring Grove, and then N to the vicinity of Baer Station and Thomasville. All this done in the dark … with the wagons. By dawn, they'd traveled 23 miles. Reports say that troopers slept in their saddles and occasionally horses would simply stop in their tracks. Then, it was still on to Dover, where total exhaustion dictated a short rest. Nevertheless scouts were sent out to look for the ANV. Then, they rode on to Carlisle … yeah, Stuart's cavalry were all played out, but were still game for a thunderous charge on the 3rd.