I'm not saying I like the guy personally, but I thought Martin Sheen turned in a credible performance in the screen version of The Killer Angels as Lee:
(Speaking to General Longstreet, who as we all know advocated doing something sane in the situation:) "But General, the enemy is here. We must whup him here, or he will whup us."
Lee was a very formal person. What he said to Longstreet was “The enemy is there” pointing toward Cemetery Ridge, “and I am going to strike him there.”