Major General George B. McClellan, with an army nearly twice the size of Lee’s, thought that he was outnumbered: “Our battle lost, and almost all would have been lost. Lee’s army might then have marched as it pleased on Washington, Baltimore, Philadelphia or New York.
General Robert E. Lee, of the Confederate States of America, knew that he was outnumbered but he had brought this Army of Northern Virginia north of the Potomac River to win a great victory: “We will make our stand.”
The plan of the Major General George B. McClellan was simple:
1. Attack on the right
2. Attack on the left
3. Attack the center “with any reserves I might have on hand”