 By the reign of Louis's father Charles VII, Philip the Good was reigning as duke of Burgundy, and the duchy had expanded its borders to include all the territory in France from the North Sea in the north to the Jura Mountains in the south and from the Somme River in the west to the Moselle River in the east.During the Hundred Years War, the Burgundians allied themselves with England against the French crown.In 1429, young Louis found himself at Loches in the presence of Joan of Arc, fresh from her first victory over the English at the Siege of Orléans, which initiated a turning point for the French in the Hundred Years War.