Contact made on McPherson's Ridge early in the day. Union forces hold and even push the Confederates back early on, mostly due to Reynold's artillery placement. Ewell and Hill arrive from the north and the west, driving the Federals from McPherson's Ridge and back through the streets of Gettysburg in a rout. Many Union prisoners taken. U.S. Army driven out of the town and up Culp's Hill. Ewell does not pursue his advantage and finish the Federals off. Instead, the Federals spend the night fortifying the heights. Reinforcements for both sides continue to arrive through the evening and night.
Lee mounts a major attack on the Union left flank at the Peach Orchard, Wheatfield, Roundtops and Devils Den with Longstreet's I Corp. After a very bloody battle, the Union still holds the high ground on their left. Lee then attacks Meade's right flank hard at Culp's Hill and Cemetery Hill with Ewell. More desparate fighting. Union repulses and still holds defensive high ground at end of day two.
Morning, Federals drive off remainder of Ewells forces at base of Culp's Hill. In early afternoon, Sedgewick's "Big Six" VI Corps arrives from Maryland after marching all night and day. Meade holds the corps in reserve. Later in the Afternoon, Lee orders a monumental frontal attack on the Union Center with artillery and three divisions of infantry. Suicide divisions are Trimble, Pettigrew, and Pickett. Union levels artillery and cuts the Confederate chargers with grape and case shot. Huge loss of life on both sides. Not enough Confederates survive to prevail, but the Union Line is pierced briefly. Stuart tries to get behind the Union center and attack from the rear, but is defeated by Union cavalry.