 Amanieu used the French occupation of Aquitaine during the war between Edward I and Philip IV of France from 1294 to 1303 to expand his own authority at the expense of the ducal administration.Between 1310 and 1324 he continued to increase his independence from the English government in Bordeaux by appealing a successive number of sometimes trivial quarrels before the Parlement of Paris.In 1324 he completed his defection from the English cause by joining the French during the short War of Saint-Sardos