Paris Gun
The British attempted to develop weapons to counter the Paris Gun, but none was ready for testing until after the Armistice. A 16-inch gun under development by Vickers for a class of never-built Russian battleships was converted and lined down to , with the designation "8-inch sub-calibre Mark I". The barrel was 120 calibres long. Testing commenced in February 1919, but after only six rounds were fired a crack was discovered, and the gun was scrapped in 1928. A weapon of similar concept, the "8-inch sub-calibre Mark II", was converted from a 12-inch gun (either Mark XI, XI*, or XII), producing a /75 calibre weapon. However, with the war ending before the gun was ready, this weapon was soon scrapped.