Panzer I it still performed much useful service against entrenched infantry and other "soft" targets, which were unable to respond even against thin armor, and who were highly vulnerable to machine gun fire. The small, vulnerable light tank, along with its somewhat more powerful successor the Panzer II, would soon be surpassed as a front-line armoured combat vehicle by more powerful German tanks, such as the Panzer III, and later the Panzer IV, Panzer V, and Panzer VI; nevertheless, the Panzer I's contribution to the early victories of Nazi Germany during World War II was significant. Later in that war the turrets
BL 13.5-inch Mk V naval gun These trials resulted in the need for a new barrel or liner; the replacement took about two weeks. The data from these experiments was important in the development of the Grand Slam bomb. After further experimental firings, the weapon was taken out of service in February 1945. British warships with the BL 13.5 inch /45 gun; BL 13.5-inch Mk V naval gun The BL 13.5 inch Mk V gun was a British heavy naval gun, introduced in 1912 as the main armament for the new super-dreadnought battleships of the . The calibre was 13.5 inches (343 mm) and the barrels