 Beginning in 1913 these carriages were disabled in the "up" position due to undesired flexibility interfering with aiming.The M1898 3-inch gun also developed a tendency for the piston rod to break when fired, and both types and their associated guns were removed from service in the 1920s.In 1893 Germany's Hermann Gruson developed an armored turret for a 53 mm gun called a "Fahrpanzer" (mobile armor) that had both road- and rail-mobile versions.