In what year was the US naval gun designed for the battleships to help Argentina counter Brazil's two "Minas Geraes"- class battleships?
12&quot;/50 caliber gun (Argentina) The 12"/50 caliber "Bethlehem" gun was a US naval gun designed in 1910 as the main armament for the Argentine Navy’s dreadnought battleships of the "Rivadavia" class .
Battleship A battleship is a large armored warship with a main battery consisting of large caliber guns. During the late 19th and early 20th centuries the battleship was the most powerful type of warship, and a fleet of battleships was considered vital for any nation that desired to maintain command of the sea.