Between 1381 and 1385, de Vienne fought against the Flemish, notably during the Battle of Roosebeke. In pursuit of his dream of threatening the English at home, in 1385 he used a 180 ship fleet to land an army in Scotland with the intent of invading England, but the force had to withdraw. After Charles VI succeeded his father Charles V to the Throne of France, the navy was allowed to decay, since Charles VI did not share his father's concern for naval affairs. Disappointed, de Vienne participated in the Barbary Crusade and joined in the crusade of King Sigismund of Hungary against the Turks. He was killed during the battle of Nicopolis, in Bulgaria.