A key reason for the Union victory at Gettysburg was the Effective use of terrain.

Union forces strategically seized high-ground locations such as Cemetery Ridge and Little Round Top, which provided significant defensive advantages. This elevated terrain allowed them to improve the effectiveness of their artillery and create robust defensive lines. By leveraging the natural landscape, the Union troops successfully hindered Confederate attacks and disrupted their formations. This tactical advantage was crucial in repelling the continuous assaults from Lee’s army, ultimately leading to the Union's decisive victory in the battle.