Harrison is a spy for the Confederate Army, hired by Longstreet. The novel begins with Harrison’s discovery of the position of the Union Army, which he immediately reports to Longstreet (who is somewhat surprised that Harrison fulfilled his assignment) and Lee (who had never agreed with hiring a spy to begin with, choosing to trust Jeb Stuart instead). Harrison has a background in acting, which he uses to advantage in his spy work, and quotes Shakespeare to calm himself as he rides through a storm. Longstreet describes him as a tiny man with a face like a weasel. Apparently loyal to the Southern cause, Harrison behaves fawningly toward Lee and Longstreet, which they ignore, dismissing him after they have finished questioning him about the enemy’s numbers and position. Harrison does not appear in the story again, though his report is vindicated on the first day of battle at Gettysburg, when Confederate brigades successfully engage with Union cavalry.