The Union Army had better logistical support during the Battle of Antietam.

The industrial strength of the North facilitated more efficient supply chains, improved transportation systems, and enhanced access to essential resources like food, ammunition, and medical supplies. This logistical advantage allowed Union forces to mobilize more effectively and sustain their operations during the conflict. In contrast, the Confederate Army struggled with logistical issues stemming from scarce resources and inadequate infrastructure, which hindered their capacity to engage in extended battles and ultimately led to the challenges they faced throughout the fight.