Yes, Lee was injured during the Maryland campaign. He was trying to restrain his horse, Traveller, and stumbled and fell. He broke a bone in his right hand and sprained his le
…ft. He had also developed a blister on one heel so he was wearing a carpet slipper instead of a boot. The injuries prevented him from riding his horse so he entered Maryland in an ambulance. He would be back in the saddle before the climax of the campaign at the Battle of Antietam Source: Landscape Turned Red, Sears, Stephen W., 1983 page 72 (MORE)