Bérard remained a supporter of the English side after the War of Saint-Sardos in 1324 when many of his family defected to the French.
At the onset of the Hundred Years’ War, in 1337, he was captain of Blaye and Puynormand on the northern march of what remained of the Duchy of Aquitaine.
By 1345 he was back in Gascony serving with his older brother Bernard Ezi IV under Henry of Grosmont, Earl of Lancaster.
In August Lancaster captured Bergerac, the principal French garrison town in Périgord, by storm.
When the Earl marched onward on 10 September he left the brothers in command of the town with a force of 1,500 men.