When Robert E Lee awoke on the morning of July 2, the Union Army of the Potomac was entrench on high ground south of Gettysburg. Lee's best Corps commander General James Longstreet tried to point out that the better tactic would be to move around the Union left and get between the Union Army and Washington DC on ground of their choice. The Union Army would then be required to leave their high ground an attack Lee who would then be on high ground. Lee told Longstreet that that is where the Union Army is and that is where I will attack it!
The Union Army was formed like a fish hook with Culp's Hill and Cemetery Hill the top of the hook running down to the Little Round Top and the Round Top
Lee ordered attacks on both Union flanks. Ewell was to hit the right flank and Longstreet the left flank. There was bloody fighting by Ewell on the Union right that ultimatly failed. Lee wanted Longsteet to take the little Round Top which was not defended earlyin the day.