SHIPS AND SUBMARINES

Canada's navy in 1914 only consisted of 2 ships, manned by 350 men. By 1918 the navy had grown to 112 war ships. The main duty of the Canadian navy was to protect Canada's eastern and western coastlines, who watched for German submarines.

  In 1915 Germany started to use a new weapon - the Submarine, called U - boats (undersea boats), who sank many British , Allied Merchant and war ships. One sinking included the British passenger liner, , on may 7,1918.

               
                        In World War 1 Naval technology was dominated by battle ships.

               http://military.discovery.com/videos/top-ten-fighting-ships-battle-cruiser.html