Below is a photo of the earliest federally-recognized Memorial Day observation, May 1, 1865, in Charleston, South Carolina. A group of freed slaves held a ceremony honoring 257 Union soldiers, prisoners of war, killed by the Confederate Army and buried in a mass grave. The freed Blacks undertook to exhume and identify the remains for re-burial.
My paternal great-grandfather was the only member of the family to meet the constitutional definition of a traitor, serving under Gen. Kirby-Smith of the Trans-Mississippi Department.
Look at the picture closely, and you will notice that the group is saluting the flag the original way, not the pantywaist "hand over heart" shit introduced in 1943.