The Yons spring, known for its therapeutic properties, gushes out iron-rich water that has been used for a very long time to treat stomach aches. It is also reputed to have been used for centuries as a meeting place for a gun fair on the night of 7 to 8 September. There, in the middle of the pines and in the dim light of resin torches, weapons and ammunition were exchanged under the greedy eye of swindlers: tests were not allowed until the following morning!