The main supply route for Fort Sumter before the battle was The Charleston and Savannah Railroad.

Before the Battle of Fort Sumter, the Charleston and Savannah Railroad served as the primary supply route for the fort. This vital transportation line enabled the movement of troops, supplies, and provisions necessary for sustaining its defensive operations. However, as tensions rose between Union and Confederate forces, the Confederacy's control over this railroad grew increasingly critical. The Union forces struggled to receive sufficient supplies, underscoring the strategic importance of railroads in wartime logistics. Ultimately, the disruption of these supply lines added to the difficulties encountered by Union troops during the bombardment.