Most of the rest of both armies arrived that evening or early the next morning. Johnson's division joined Ewell and Maj. Gen. Richard H. Anderson's joined Hill. Two of the three divisions of the First Corps, commanded by Lt. Gen. James Longstreet, arrived in the morning. Three cavalry brigades under Maj. Gen. J.E.B. Stuart were still out of the area, on a wide-ranging raid to the northeast. Gen. Lee sorely felt the loss of the "eyes and ears of the Army"; Stuart's absence had contributed to the accidental start of the battle that morning and left Lee unsure about enemy dispositions through most of July 2. On the Union side, Meade arrived after midnight. The II Corps and III Corps took up positions on Cemetery Ridge, and the XII Corps and the V Corps were nearby to the east. Only the VI Corps was a significant distance from the battlefield, marching rapidly to join the Army of the Potomac.^[55]

The first day at Gettysburg—more significant than simply a prelude to the bloody second and third days—ranks as the 23rd-largest battle of the war by number of troops engaged. About one quarter of Meade's army (22,000 men) and one third of Lee's army (27,000) were engaged.^[56] Union casualties were almost 9,000; Confederate slightly over 6,000.^[57]