So there is no written order from Lee ordering Stuart to attack the rear of Cemetery ride on the third day at Gettysburg.
I have no idea for sure, but I would assume there is not. I never tried to learn much about any of the battles. I have no interest in reading about people killing each other for no good reason.
I focus on how it started and why. After it started, it was nearly a foregone conclusion that the population four times as numerous and with probably ten times more resources, was going to win.