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.
Naval warfare in the Mediterranean during World War I naval bases, initially under the Austrian navy flag, later under the German navy flag. The Kingdom of Italy during World War I had six dreadnought battleships ( as a prototype, , and of the , and of the ). During the war, both the Italian Royal Navy and the Austro-Hungarian Navy kept their most modern capital ships inside their bases (Pola and Kotor for the Austrian Fleet, Brindisi and Taranto for the Italian fleet), leaving mostly submarines, destroyers, torpedo boats and scout cruisers to do any fighting. The so-called Adriatic Campaign of World War I consisted mainly of relatively minor