Considered archaic and appropriate only in emergencies, the royal arrière-ban was re-instituted in France by Philip IV (1285–1314), who asserted his right to military service from the tenants and vassals of his vassals. The arrière-ban was proclaimed throughout the Kingdom of France on 30 April 1337, at the start of the Hundred Years' War. Thereafter, there were numerous summons, causing the practice to become ineffective and unpopular. After the disaster at Poitiers, the arrière-ban was not used for some decades as Charles the Wise introduced a more permanent fighting force. It reappeared after 1410. Its practice continued into the early modern period, notably during the Thirty Year's War. In in 1636, when the Spanish approached Paris, Louis XIII successfully gathered thousands of noblemen to defend the city by calling ban (of his vassals) and the arrière-ban (of all free men), allowing him to repel the Spanish.