The American Civil War did not begin with a grand battle but with a standoff over a small island fort in Charleston Harbor. This film traces the years of political fracture that led to April 1861, when Confederate batteries opened fire on the Union garrison at Fort Sumter, forcing its surrender without a single defender killed in the exchange. Historians walk through the secession crisis state by state, the failed compromises in Washington, and the standoff between Major Robert Anderson's besieged troops and the South Carolina forces surrounding them, explaining why Sumter became the flashpoint rather than any of the other contested federal outposts in the South. Archival maps, period photographs, and location footage of the harbor and fort anchor the narration as it moves from the political maneuvering in the months before the attack to the shelling itself and its immediate fallout, when Lincoln's call for troops turned a standoff into a war that would run for four more years.