Isle of Man Steam Packet Company England, Wales, Scotland and Ireland. Ports served included Liverpool, Silloth, Whitehaven, Holyhead, Ardrossan, Blackpool, Belfast and Dublin. Vessels and crews of the company were actively involved in both the First and Second World Wars. One vessel, , was attached to the British Grand Fleet and led the German High Seas Fleet into Scapa Flow in the Orkney Islands at the end of the First World War. Another vessel, "Viking", was converted to become a seaplane carrier, serving as . During the First World War, eleven out of a total fleet of fifteen Steam Packet ships were requisitioned by the Admiralty.
European theatre of World War I convoy system in early 1917. There was one great battle in the waters near Europe: the Battle of Jutland 31 May 1916 – 1 June 1916 between the German High Seas Fleet and the British Grand Fleet. This was one of the largest sea battles in world history though, in some respects, the battle was inconclusive. In the Adriatic, some very limited sea combat took place between the navy of Austria-Hungary and the Allied navies of France, Britain, and Italy. The strategy of the Allies was to blockade the Adriatic and monitor the movements of the Austrian fleet. In general,