True, only Lee knew his own mind. That is simply my belief of Lee's state of mind. I have read a lot of books on this battle. Most authors blamed Longstreet's bungling and delay in the timing of the attack for the failure. It is a reasonable perspective. However, many of the authors seem desperate to find a scapegoat for Lee's role in the attack (to me). The most compelling argument I have read against that perspective was in a book by Jeffrey Wert "General James Longstreet: The Confederacy's Most Controversial Soldier 1994". I would read that before you go to the battlefield. I have walked it, and looked out from the "little clump of trees" Lee referenced. I looked at the ground, and agreed with Longstreet's famous quote to Lee, "General, I have been a soldier all my life. I have been with soldiers engaged in fights by couples, by squads, companies, regiments, divisions, and armies, and should know, as well as any one, what soldiers can do. It is my opinion that no fifteen thousand men ever arranged for battle can take that position." The best overall account of the battle, and of the War in general I have read was Shelby Foote's "The Civil War: A Narrative". It is a massive, 3000 page text, but worth the time reading at least the Gettysburg parts prior to visiting. It is very well written, referenced, and included some very nice maps.