Panzer II variants the Pz.Kpfw. IIJ, it was redesigned after the Panzer V Panther, most noticeably with the introduction of fully sloped frontal armor. Two versions were initially planned, a lighter, faster 18-ton variant and a slower, 26-ton vehicle; the former was abandoned at an early stage. Subsequently, work on the first prototype was abandoned when it was determined that the vehicle was underarmed for its weight, and versions of the Panzer IV and V could serve just as well in the reconnaissance role while being more capable of defending themselves. This vehicle never received an official Panzerkampfwagen title, but it would have
BL 13.5-inch Mk V naval 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 were 45 calibres long i.e. 607.5 inches (15.43 m). The guns were greatly superior and unrelated to the earlier 13.5-inch (30-calibre) Mk I to Mk IV guns used on the , and es completed between 1888 and 1896. The gun was developed in response to the relative failure of the British high-velocity 12-inch Mk XI and