In the back of Schlieffen’s mind always glimmered the hope that, as battle unfolded, a counterattack by his left wing could be mounted in order to bring about a true double envelopment—the “colossal Cannae” of his dreams. Sternly saving his greatest strength for the right wing, he did not yield to that vaulting ambition in his plan. But the lure of the left wing remained to tempt his successors.