" Lanrezac’s sin was in having been right, all too vocally. He had been right from the beginning about the fatal underestimation of the German right wing as a result of which a fair part of France was now under the German boot. His decision to break off battle at Charleroi when threatened with double envelopment by Bülow’s and Hausen’s armies had saved the French left wing. "

― Barbara W. Tuchman , The Guns of August