 While the Naval clasps were authorised in August 1920, none were awarded and the idea was abandoned in 1923 on the grounds of excessive cost.The British War Medal was awarded to all officers and men of British and Imperial forces who had served for a prescribed period during any stage of the war, or who had died on active service before the completion of this period.Eligibility was subsequently extended to cover service in 1919 and 1920 in mine-clearing at sea as well as participation in operations in North and South Russia, the eastern Baltic region, Siberia, the Black Sea and the Caspian Sea, during the allied intervention in the Russian Civil War.