Mount Saint-Michel is the tidal island of Normandy, France. The Monastery of Mount Saint Michel is located on an island just a few hundred metres from land, making it possible for pilgrims to reach the monastery at low tide, but when the tide comes, the pilgrims will be stranded, driven or flooded, a good place to protect. In the centenary war, the island was not conquered; a small garrison resisted the full-scale British attack in 1433.