Who was Robert E Lees left-hand man?

Answer 1

Stonewal Jackson, killed at Chancellorsville - after which neither Lee nor his army was quite the same again.

Another answer could be cavalry leader Jeb Stewart who was Lee's eyes and ears at many battles, but helped him to lose Gettysburg, and was killed at Spotsylvania.

Answer 2

Provided that General "Stonewall" Jackson was Lee's right-hand man, his left-hand man should had been J.E.B Stuart or General James Longstreet.

Answer 3

General Thomas J (Stonewall) Jackson.