Gen. John Sedgwick's 14,000 men arrive making Meade's army fully concentrated. Longstreet's men deploy along Seminary Ridge and are surprised at Sickles' irregular position. Fighting begins in Devil's Den. Fighting begins at Little Round Top. Gen. Gouverneur Warren requests reinforcements due to danger to the Federal left flank.
Fighting begins in the Wheat Field.
Devil's Den is captured by the Confederates. Gen. George Pickett arrives but rests his men for the night. Confederates begin an assault on Cemetery Hill. A Confederate brigade reaches the crest and is forced to fall back. Meade meets with staff and corps.