John Cassell,
Cassell's Illustrated History of England
(1865)
“ The Parliament, as might have been expected, adjudged the duchy to Charles of Blois, declaring that John de Montfort had forfeited whatever claim ho might have by his treasonable homage to the King of England. Philip ordered his eldest son to march into Brittany at the head of an army to assist Charles of Blois to expel John de Montfort. Under him, but the actual commander of the forces, was a celebrated warrior, Louis de la Cerda, commonly called Don Louis of Spain ”
