Fort Sumter, South Carolina, April, 1861, under the Confederate flag. The first shots of the Civil War took place here, on April 12, 1861, as Confederate batteries opened fire on the Union fort, bombarding itfor 34 straight hours. On April 13, Union forces surrendered and evacuated the fort. Union forces made many attempts to retake the fort throughout the war, but only took possession on February 22, 1865, after Confederate forces had evacuated Charleston.