One of the main challenges faced by Union troops at Fort Sumter was the Lack of reinforcements.

A major challenge for Union troops at Fort Sumter was the severe shortage of reinforcements. As tensions rose in the lead-up to the Civil War, the fort's garrison, commanded by Major Robert Anderson, became isolated and was unable to obtain crucial support from the North. This lack of reinforcements rendered the Union forces vulnerable during the Confederate bombardment. Although they were resolute in their commitment to defend the fort, their limited manpower and resources ultimately impeded their ability to withstand the ongoing assaults. This situation underscored the difficulties the Union would face in the war's early stages.