 In the U.S., due to lack of funding for sufficient replacements, the disappearing gun remained the most numerous type of coast defense weapon until replaced by improved weapons in World War II.Although some early designs were intended as field siege guns, over time the design became associated with fixed fortifications, most of which were coastal artillery.A late exception was the use in mountain fortifications in Switzerland, where six 120mm guns on rail-mounted Saint Chamond disappearing carriages remained at Fort de Dailly until replaced in 1940.