That distinction goes to Gen. Nathan Bedford Forrest.
Good argument... but those are the words of Union Maj. Gen. John Sedgwick - who two days prior to Gen. Stuart being mortally wounded, became the highest-ranking officer to die in the Civil War. While Sedgwick and his officers were being targeted by Confederate sharpshooters some 1,000 yards away, Sedgwick ironically told his men “Why are you dodging like this? They couldn’t hit an elephant at this distance.” Famous last words - Sedgwick is shot in the head moments later.
Custer was no slouch, he did afterall save the Union at Gettysburg.