The famous battle that marked the turning point of the American Civil War was the Battle of Gettysburg, fought from July 1 to July 3, 1863. This pivotal confrontation between the Union and Confederate forces halted the northern advance of General Robert E. Lee into Union territory. The Union victory at Gettysburg resulted in heavy casualties on both sides and weakened the Confederate army's morale. The battle helped to turn the tide of the war in favor of the Union and is often considered a crucial moment in the struggle for preserving the United States.