The two Bismarck-class battleships were designed in the mid-1930s by the German Kriegsmarine as a counter to French naval expansion, specifically the two Richelieu-class battleships France had started in 1935. Laid down after the signing of the Anglo-German Naval Agreement of 1935, Bismarck and her sister Tirpitz were nominally within the 35,000-long-ton (36,000 t) limit imposed by the Washington regime that governed battleship construction in the interwar period. The ships secretly exceeded the figure by a wide margin, though before either vessel was completed, the international treaty system had fallen apart following Japan's withdrawal in 1937, allowing signatories to invoke an "escalator clause" that permitted displacements as high as 45,000 long tons (46,000 t).[3]