I get some take on Bragg's leadership style at Chickamauga. During the first day's battle he pushes into combat just as Longstreet's two divisions are ariving - one at a time, which he feeds piecemeal into the fray. He re-organizes the army during the night of the cruicial combat. Then he claims that Longstreet will have the "left wing" of the army to command, but sends no guides or horses for them (Longstreet and staff horses were still in Atlanta). Finally Longstreet wrangles horses in the darkness and heads off to find Bragg's headquarters - on the Confederate side of the creek, in a spot where even their own messengers could not find them. After almost getting captured stumbling into Union lines, Longstreet finds Bragg's headquarters, where he has already gone to bed. After awakening Bragg the army commander gives a swift layout of the lines at the end of the day and says he is to lead the left flank, but he then goes to bed.
I can't imagine Lee or Grant or Meade leaving things up in the air like that - they would have had headquarters staff persons waiting for each train, telling infantry units where to march, and when Longstreet arrived they would have mounts and led them to Bragg's headquarters.