From a strategic and tactical standpoint, Lee should have withdrawn his forces on July 2, 1863, and relocated his entire army along terrain that would have better suited his aggressive style of fighting. According to Napoleon, Frederick the Great as well as Sun Tzu it is almost impossible to defeat a standing army reinforced with heavy artillery which are strategically located on elevated terrain, such as Cemetery Hill, which was the keystone or key position of the Gettysburg Battlefield. I believe if Ewell had tried to attack Cemetery Hill on July 1, 1863, the same result would had occurred as that of Pickett's Charge. Once again General Longstreet was correct in telling Lee that the tactical position of the Army of Northern Virginia was at a great disadvantage to attack an entrenched enemy complimented and reinforced with plenty of artillery and with the added advantage of using interior lines to reinforce any weak position along the fish hook rather quickly. To quote Longstreet, "there are no seventeen thousand men in this world that can take that position." David.