Ely,Stuart served under Lee,so technically anyone who rode with Stuart rode with Lee. Lee also had several sons who served the South in the conflict...could any have been cavalry officers? Nit-picking,I know.

I always like the line

"When a horse-man passes, the soldiers have a rule, To cry out their loudest, - "Mister, here's your mule?"

I believe the shout was a self-deprecating reference to the footsoldiers themselves as the foot-sloggers who carried everything on their backs.