The Hundred Years' War between England and France allowed for accelerated social and political development in Western Europe. Henry V of England won major victories at Crecy and Agincourt, but Henry VI lost much territory. Joan of Arc helped inspire French victories that turned the tide of the war in favor of France. By the end, only Calais remained under English control. The war weakened feudalism and led to the development of national armies and new styles of warfare. In France, Louis XI strengthened the monarchy and promoted unity.