It comes from a statement Jackson made before the war. He said, "if war does come, we need to draw our sword and throw away the scabbard." So the book's title is THROW AWAY THE SCABBARD.
Usually, when I am stuck, I go back over what I have done before so I don't get out of the habit of being before the manuscript every day.
“Two Away From Thirty” LOL
Ironically, Jackson and Lee saw completely eye-to-eye on such matters as bravery, honor, and military tradition, but Lee may well have done better to depend on Longstreet as a tactician. Longstreet was of course also a brave man, but not the modern-day knight of chivalry that Jackson and Lee both were.
Longstreet's was a more forward-thinking vision, and it marked him as a general of the Grant mold. He understood how to use modern weaponry to slaughter the enemy in industrial quantities.