The terrain at Gettysburg influenced Union tactics by allowing for effective use of artillery.

The hilly terrain offered Union forces advantageous high ground, especially at Cemetery Ridge and Little Round Top. This elevation allowed Union artillery to oversee the battlefield, enabling them to strike advancing Confederate troops with improved precision and effectiveness. Additionally, the natural features of the landscape supported robust defensive positions, complicating efforts for Confederate forces to breach Union lines and ultimately aiding in the Union's success in the battle.