April 12, 1861 Charleston Harbor saw over 3,300 shells bombarding Fort Sumter - the Civil War's start. Anthony Mason tours with bestselling author Erik Larson, who delves into the events leading to the bombardment in his latest book "The Demon of Unrest." https://cbsn.ws/44mnkhq | CBS Sunday Morning

On April 12, 1861, over 3,300 shells rained on Fort Sumter, marking the start of the Civil War. @AnthonyMasonCBS talks to author Erik Larson about his book on the event, calling it "the single most consequential day in American history." https://cbsn.ws/3UBscvE | CBS Sunday Morning