This five -volume history of the part played by the Royal Navy in the Great War is based chiefly on the records of the Historical Section of the Admiralty, with the full help of the German Admiralty. These records include telegrams to and from the Admiralty, reports from officers in command, minutes of proceedings of the War Cabinet and other state papers. It also makes use of allied ministers conference records, ships logs, signal logs, captains and squadron commanders despatches as well as battle orders to the fleet and local records of every base and shore station. It contains maps, plans and diagrams of the original which was published between 1920 and 1931.