sentences:  The Bastille design was copied at Pierrefonds and Tarascon in France, while its architectural influence extended as far as Nunney Castle in south-west England.During the 15th century the French kings continued to face threats both from the English and from the rival factions of the Burgundians and the Armagnacs.The Bastille was strategically vital during the period, both because of its role as a royal fortress and safe-haven inside the capital, and because it controlled a critical route in and out of Paris.