The role of cavalry units at Antietam was primarily focused on flanking and reconnaissance.

Cavalry units were crucial for gathering intelligence about enemy movements, assessing terrain, and disrupting supply lines. During the battle on September 17, 1862, both Union and Confederate cavalry engaged in skirmishes, aiming to provide support for their respective infantry forces. Their mobility allowed them to exploit weaknesses in the opposing army’s formations, conduct quick strikes, and retreat as necessary. This adaptability was vital in the chaotic environment of Antietam, where understanding troop positions and movements could significantly influence the outcome of the battle.