Le Croisic, is a commune in the Loire-Atlantique department in western France. It is part of the urban area of Saint-Nazaire. The United States Navy established a naval air station on 27 November 1917 to operate seaplanes during World War I. The base closed shortly after the First Armistice at Compiègne. The writer and historian Auguste Lorieux was born in Le Croisic.
During World War II, Le Croisic was home to a radar station for the Wehrmacht following the surrender of France and construction of the U-boat submarine pens at Saint-Nazaire, in order to protect the Loire estuary from enemy attack due to the Normandie dry dock at Saint-Nazaire that could be used to repair the large Kriegsmarine battleships such as the Bismarck and its sister ship, Tirpitz. However, in the March 1942 St Nazaire Raid, a British Commando team on the obsolete HMS Campbeltown and several motor launch boats were able to slip by the Le Croisic radar station and ram Campbeltown into the Normandie dry dock gate, before sabotaging other vital parts to the dry dock.