What is the year of the event that occured first, the Battle of Gettysburg was fought, or Operation Overlord was launched?
Battle of Gettysburg: The Battle of Gettysburg ( , with an sound) was fought July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War. Operation Overlord: Operation Overlord was the codename for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied Western Europe during World War II. Operation Overlord:  The operation was launched on 6 June 1944 with the Normandy landings (Operation Neptune, commonly known as D-Day).
1863