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.
History of the United Kingdom during the First World War accompanying cruisers and destroyers bombarded the coastal ports of Yarmouth and Lowestoft. Although the ports had some military importance, the main aim of the raid was to entice out defending ships which could then be picked off either by the battlecruiser squadron or by the full High Seas Fleet, which was stationed at sea ready to intervene if an opportunity presented itself. The result was inconclusive: nearby Royal Navy units were too small to intervene so largely kept clear of the German battlecruisers, and the German ships withdrew before the first British fast response battlecruiser squadron or the Grand Fleet