Gen. J.E.B. Stuart arrives from Carlisle and reports to Lee. Gen. Dan Sickles moves 11,000 men about one mile in front of the Federal line. 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.