The Battle of Antietam demonstrated a shift towards industrial warfare.

The battle showcased the devastating effectiveness of modern weaponry, such as rifled muskets and artillery, which resulted in unprecedented casualties. It highlighted how industrial advancements in manufacturing and technology transformed the nature of combat, making traditional tactics increasingly ineffective. The sheer scale of destruction and the high number of wounded underscored the need for better medical care and logistics. This battle marked a turning point, illustrating the brutal realities of warfare in the industrial age and foreshadowing future conflicts.