One of the main advantages of the Union Army was Larger numbers and resources.

The Union possessed a considerable edge in troop numbers, fielding about 93,000 soldiers at Gettysburg, while the Confederate forces numbered around 71,000. This numerical advantage enabled the Union to better withstand casualties and hold their defensive lines. Furthermore, the North's industrial capabilities ensured a continuous supply of weapons, ammunition, and other essential resources. This logistical superiority allowed the Union Army to maintain superior equipment and supplies, playing a crucial role in their success during the battle.