During the Second World War, the Norman Switzerland railway line crossing the Clécy viaduct was the only line still usable by the German occupiers on the morning of June 5, 1944, on the eve of the Normandy landings. Following the coded message The ploughman's field in the foggy morning broadcast by the BBC, resistance fighters from the Saint-Clair maquis blew up the track near Grimbosq on the night of June 5 to 6. Quickly put back into service, the railway line allowed in 1946 the delivery of humanitarian aid offered by the inhabitants of Yverdon-les-Bains, in French-speaking Switzerland, to those of Norman Switzerland.