Photos: Gettysburg re-enactments mark 150th anniversary A Union infantryman lies on the ground during a re-enactment of the Battle of Gettysburg on Friday, June 28, at the start of the 150th Gettysburg celebrations in Gettysburg, Pennsylvania. More than 10,000 re-enactors will pay tribute to the major clashes that took place in Gettysburg during the 1861-1865 U.S. Civil War.