The Le Hardi class was designed to escort the fast battleships of the and to counter the large destroyers of the Italian and Japanese es.[1] The ships had an overall length of 117.2m (384.5feet), a beam of 11.1m (36.4feet),[2] and a draft of 3.8m (12.5feet). The ships displaced 1772LT at standard and at deep load. They were powered by two geared steam turbines, each driving one propeller shaft, using steam provided by four Sural-Penhöet forced-circulation boilers. The turbines were designed to produce 58000PS, which was intended to give the ships a maximum speed of 37kn. Le Hardi, the only ship of the class to run sea trials, comfortably exceeded that speed during her trials on 6 November 1939, reaching a maximum speed of from 60450sp=usNaNsp=us. The ships carried 4700NaN0 of fuel oil which gave them a range of 3100nmi at . The crew consisted of 10 officers and 177 enlisted men.[3]
The main armament of the Le Hardi-class ships consisted of six Canon de Modèle 1932 guns in three twin mounts, one forward and a superfiring pair aft of the superstructure. Their anti-aircraft (AA) armament consisted of one twin mount for Canon de 37mm Modèle 1925 guns on the aft superstructure and two twin Hotchkiss 13.2mm AA machine gun mounts on the roof of the shell hoists for the forward 130 mm mount. The ships carried one triple and two twin sets of 550mm torpedo tubes; the aft mount could traverse to both sides, but the forward mounts were positioned one on each broadside. A pair of chutes were built into the stern that housed a dozen 200kg (400lb) depth charges.[4]
In late 1941 or early 1942, the twin Hotchkiss machine guns were repositioned on the quarterdeck and a pair of single mounts for 25mm Hotchkiss AA guns were installed in their place in front of the bridge. In addition a pair of single mounts for Browning 13.2-millimeter AA machine guns were added on platforms on the sides of the superfiring turret aft.[5]
Ordered on 4 May 1936, Casque was laid down by Forges et Chantiers de la Méditerranée at their shipyard in La Seyne-sur-Mer on 30 November 1936. She was launched on 2 November 1938 and entered service on 20 June 1940. That day the ship steamed for Oran, French Algeria. After the British attacked French Navy ships in nearby Mers-el-Kébir on 3 July, Casque joined the other destroyers in Oran in leaving that day for a safer port, but she had to return to Oran because she had damaged her propeller while getting underway. After repairs, the ship rendezvoused with her sister and they reached Toulon on 7 July, at which time she was immediately placed in reserve.[6] Amid high tensions with the United Kingdom, Casque and the destroyer escorted the tanker and the submarines,,, and through the Strait of Gibraltar during a voyage Lot and the submarines made from Oran to Casablanca between 16 and 18 October 1940.[7]
Casque was assigned to the French: [[Forces de haute mer]] (High Seas Forces) on 1 May 1942, replacing Le Hardi in the 10th DT (French: division de torpilleurs), although she was not ready for service until 1 July. When the Germans attempted to capture the French ships in Toulon intact on 27 November 1942, Casque was scuttled by her crew. The Italians attempted to salvage her, but the effort was abandoned after the ship was damaged during the Allied bombing raid on 29 April 1944; she was finally refloated in 1948 and scrapped.[8]