 "Chatelain" forced the enemy submarine to the surface with two depth charge attacks, then joined in the general firing at point-blank range which followed, sending "U-515" to the bottom at .On 4 June 1944, "Chatelain" had the distinction of initiating one of the most dramatic incidents of the war, when she made a sound contact, and hurled a barrage of hedgehogs at a U-boat.A second attack by "Chatelain", this time with depth charges, holed s outer hull and forced her to surface, her crew jumping overboard as she broke water.