Should be interesting. Been a long time since I researched it, but neither Longstreet nor Pendleton (I think Pendleton was in charge of the arty, vague on this.) wanted to take responsibility for initiating the attack. Longstreet tried to commit the decision to the artillery. Bg. Gen. Rans Wright, a lawyer, was involved with writing a message from Pendleton back to Longstreet that was very legalistic in making it clear that it was Longstreet's call when and whether to give the order to advance, not the artilleryman's call.