When did the Battle of Gettysburg, Secession of Fort Sumter, battle of Antietam, surrender at Appomattox Courthouse, and Sherman's March to the Sea happen?

The Battle of Gettysburg occurred from July 1 to July 3, 1863. The secession of Fort Sumter took place on April 12, 1861. The Battle of Antietam occurred on September 17, 1862. The surrender at Appomattox Courthouse happened on April 9, 1865. Sherman's March to the Sea took place from November 15 to December 21, 1864.