Files contain documents regarding storage of explosives at Explosive Fog Signal Stations. Included are details of: quantities of explosives each stations, storage and security conditions (September 1917) ; police escort when transporting explosives (February 1919) ; stocks of explosives to be reduced to a minimum (May 1920) ; police or military protection for explosives in unaffordable (August 1920) ; discontinuance of Fog Signals at mainland Fog Signal Stations (January 1921) ; reduction of explosives on board Lightships (June 1921). Correspondents include Headquarters, Irish Command, British Army ; Inspector ; Lord Lieutenant; Under Secretary Dublin Castle ; Admiralty.

File contains statement from Officer-in-Charge, Armament Supply, R.N.A. Depot, Haulbowline Cork, showing ammunition belonging to Irish Lights on charge on the 31st March 1921, in the Magazine at Rocky Island (Cork).