No. 18 Squadron formed initially as a training unit at Northolt on 11 May 1915. During the Great War, it concentrated on bombing, and after the Armistice moved to Germany as part of the Army of Occupation before returning the UK in September 1919 and disbanding. The Squadron remained dormant until reformed in October 1931at Upper Heyford with Harts and then Hinds.
NOT a sqn historian, just a Googler