Union forces regarded Fort Sumter as a vital stronghold in the early days of the Civil War. Its strategic position at the entrance of Charleston Harbor made it an essential defensive site against Confederate naval assaults and safeguarded Union shipping routes. Retaining control of Fort Sumter was crucial for establishing a military presence in the South and asserting dominance over the area. Although it was ultimately captured by Confederate troops, the fort symbolized the Union's dedication to preserving the nation and highlighted the importance of coastal defenses within the larger framework of the conflict.