The pivotal 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 clash between Union and Confederate forces resulted in a significant victory for the Union Army and is often considered the war’s turning point due to its considerable casualties and effect on Northern morale. The defeat halted Confederate General Robert E. Lee's invasion of the North and set the stage for Union General Ulysses S. Grant's advanced strategy, ultimately leading to the Union's victory in the Civil War.