The 1938 Gettysburg reunion was an encampment of American Civil War veterans on the Gettysburg Battlefield for the 75th anniversary of the Battle of Gettysburg. The gathering included approximately 25 veterans of the battle with a further 1,359 Federal and 486 Confederate attendees out of the 8,000 living veterans of the war. The veterans averaged 94 years of age, Transportation, quarters, and subsistence was federally funded for each veteran and their accompanying attendant.

https://en.wikipedia.org/wiki/1938_Gettysburg_reunion