score:7
In the end progress in a war like this was made by capturing castles and cities, or keeping them. (the focus on big battles can be misleading) Bertrand du Guesclin did both. If it wasn't for him the english would have conquered Rennes and Nantes (and thus held Bretagne). He also advised charles to use a scorched earth tactic against the invasion of Richard III. Richard besieged many cities but failed to take any but Caen. (fun story, in the English wikipedia this is only rewarded one sentence: Yet a campaign in 1359, meant to complete the undertaking, was inconclusive. while it's rewarded half a page on the French.) He also helped Henri of Trastamare on the spanish throne, and as a bonus managed to lure several thousands of mercenaries (who had been living as robbers in france for decades) with him.
In the end the progress made by Du Guesclin was obtained by fighting against the free companies, defending castles and methodically besieging castle after castle, which is how he died