For many years the West Point Military Academy seniors visited the field, usually in the month of May, remaining several days in order to study the strategical and tactical features of the battle in preparation for a required thesis. These visits have been discontinued since the World War. In May, 1917, a training-camp for World War soldiers was established within the limits of the Park. The 4th, 7th and 58th Regiments of U. S. Infantry were transferred from El Paso, Texas, augmented by recruits, and divided into six United States Regular Regiments, viz.: 4th, 7th, 58th, 59th, 60th, and 61st. After being trained they were sent either to other camps or to the battlefields of France. During the year 1918 a unit of Tank Service was trained on the battlefield. The fortifications remaining within the park include a line of earthworks on Culp’s Hill, which was thrown up by the Union troops of the 12th Corps. On East Cemetery Hill there are a number of lunettes at the position held by the Union batteries. The stone wall along the west side of Hancock Avenue, extending from the Taneytown Road to some distance south of the Angle, where Armistead crossed it in Pickett’s Charge, is well preserved, and practically the same as at the time of the battle. There are some stone walls on the south side of Little Round Top that were erected and used by the Union forces. At the base of Big Round Top and along Seminary Ridge are long stone walls, erected and used by the Confederates. The boulders in the vicinity of Devil’s Den and the Round Tops afforded natural defences for both armies. A line of earthworks on South Hancock Avenue is still in good condition. [Illustration: The Virginia Memorial.—The bronze group represents the various arms of the Confederate service. Above is a portrait statue of General Lee. The Memorial is the work of F. W. Sievers.] The physical features of the Park are both varied and interesting. Standing in bold relief in the background at a distance of about 8 miles is a continuation of the Blue Ridge, designated locally as the South Mountain. This range, bounding the Shenandoah Valley of Virginia and the Cumberland Valley of Pennsylvania, screened the advance of the Confederate Army, and it was at the Cashtown Gap that General Lee ordered a concentration of his forces before his advance on Gettysburg.