spring 1359 he led a mainly english army out of mantes to relieve the garrison of saint-valéry. the garrison surrendered 21 april before philip could arrive. he instead led his army into western champagne where he sustained himself for six weeks while evading the counterattacks of the constable and admiral of france, returning to normandy in early june having achieved little of lasting value. on 20 august 1359 charles of navarre made his peace with the dauphin. philip however chose to continue in the service of the king of england as did many of the navarrese garrisons in normandy.