A key feature of Fort Sumter’s construction was its earthen mounds, which were designed to absorb and deflect cannon fire.

A key feature of Fort Sumter's construction was its earthen mounds, which were designed to provide effective protection against artillery fire. These mounds, made of compacted earth, allowed the fort to absorb and deflect incoming cannonballs, enhancing its defensive capabilities. The fort's design included a combination of brick and earthworks, creating a stronghold that was strategically located in Charleston Harbor. This construction method was typical for coastal fortifications of the time, aiming to withstand bombardments. Despite these defenses, the fort ultimately succumbed to a sustained Confederate attack in April 1861, marking the start of the Civil War.