The naval warfare-type guessing game was devised in the early 1900s by Clifford Von Wickler. Called Salvo in 1931, the game originally was played with paper and pencils. Milton Bradley Co. released the game as Broadsides: The Game of Naval Strategy in 1943 and as Battleship in 1967, when plastic grid boards, ships and pegs were introduced so players could easily record hits and misses. During the game, two players secretly arrange a fleet of 10 ships—aircraft carriers, battleships, cruisers, submarines and destroyers—on the lettered and numbered grids. Players take turns targeting their opponent’s fleet by guessing coordinates where the hidden ships are positioned. The battle ends when one player’s entire fleet is sunk.