And it was Baldy Smith, the corps commander who had been farthest forward with his troops on June 3, who asserted years later that the concept of that assault -- "an attack along the whole line -- is denounced by the standard writers on the art of war, and belongs to the first period in history after man had ceased to fight in unorganized masses. Giving up the few advantages belonging to the assailants, it increases largely the chances of successful defense, and would never be adopted by a trained general, except perhaps under certain peculiar conditions, where also the attacking force had an overwhelming superiority in numbers."
Baldy Smith's quote
Reader Paul Martini has generously supplied the quote I was looking for here. He says it "came from Ernest Furgurson's Not War But Murder on page 235."