I know that Bertrand du Guesclin was the constable of France from 1369-1380, whose role in the "roll back" of English domination of France was second only to that of Joan of Arc.
Although he won a number of victories against the English, none of them were as spectacular as English victories at Crecy, Poitiers, or Auray. My understanding is that du Guesclin was renowned for his "Fabian tactics" and war of attrition. Because he was not a high ranking noble, many Frenchmen refused to serve under him, and his armies were smaller than French armies typically were, meaning that he enjoyed less favorable numerical odds than other French commanders. Yet he managed to regain a considerable part of western France during those eleven years.
How was that?