total of sixteen depth charges, with eight more in reserve. They were also fitted with a pair of depth-charge throwers, one on each broadside abreast the aft funnels, for which they carried a dozen depth charges. The ships could be fitted with rails to drop forty Breguet B4 mines. With a de-emphasis on anti-submarine warfare for the s, the depth-charge throwers were removed in 1936 and more 200-kilogram depth charges were carried in their place. Fire control for the main guns was provided by a Mle 1929 electro-mechanical fire-control computer that used data provided by a SOM B.1926 coincidence rangefinder atop the bridge. The computer could not compensate for the ships' motions and the guns could only be fired accurately when the ships were level. The rangefinder was replaced by a OPL Mle E.1930 stereoscopic rangefinder in 1934 and the SOM rangefinder was repositioned to the base of the mainmast. The following year, Cassard was the test ship for a new OPL E.1935 rangefinder in a two-man turret and an auxiliary Mle 1919 fire-control computer in the base of the turret. With the trial being successful, the new rangefinder in its turret replaced the E.1930 rangefinder in the rest of the Vauquelins in 1935–1936, although the latter was transferred to a new turret built around the base of the mainmast. Wartime modifications The reconsidered its anti-submarine warfare tactics after the war began in September and intended to reinstate the depth-charge throwers, although these were an older model than the one previously installed. Depth-charge stowage now consisted of 24 heavy depth charges and 16 of the 100-kilogram ones for those ships that received the throwers. There was a shortage of them and only , Vauquelin and received them beginning in May 1940. As an interim measure, a pair of rails were installed on the stern for depth charges. Each rail could accommodate three depth charges and ten more were stored in the magazine. The Vauquelin-class ships were allocated British Alpha 128 Asdic systems in April 1940, although they were slowly installed on the surviving ships between May and the end of 1941; Le Chevalier Paul did not receive one before her loss in June 1941. In May 1940, Vauquelin and Kersaint received a pair of twin-gun 37-millimeter mounts; the former lost all of her 37-millimeter guns in exchange while the latter retained a pair of her single mounts. Beginning in 1941