Site of the opening engagement of the Civil War. Major Robert Anderson concentrated his units here, and, when Lincoln took office on March 4, 1861, it was one of only two forts in the South still under Union control. Learning that Lincoln planned to send supplies to reinforce the fort, on April 11, 1861, Confederate General Beauregard demanded Anderson's surrender, which was refused. On April 12, 1861, the Confederate Army began bombarding the fort, which surrendered on April 14, 1861. Congress declared war on the Confederacy the next day.