An item referred to the magazine Schiffbau reporting that as a result of the Washington Naval Treaty on 20 January the former dreadnought Monarch (1) was used as target and sunk. She was launched in 1911 as part of the Orion-class. During 9 hours was she attacked off the Scilly’s by aircraft, 15cm gunfire from the cruisers Carysfort, Caledon, Curacao and Calliope and destroyed by the 38cm guns of the battleships [and battle cruisers] Hood, Revenge, Ramillies, Royal Oak, Royal Sovereign and Repulse, firing from a distance of 18-22 kilometres.
1. Building ordered under 1909 Naval Estimates. Laid down by Armstrong, Elswick, England with yard number 828 on 1 April 1910, launched on 30 March 1911, commissioned in February 1912, decommissioned in 1921, target ship since 14 June 1924, decommissioned and scrapped of valuable parts at Portsmouth and sunk on 21 January 1925 while used as target on a distance of around 50 miles south of the Isles of Scilly by bombers, destroyers and battleships of which the HMS Revenge sunk her finally. Building costs 1.888.736 pond sterling. Building costs 1.892.823 pond sterling and she caused the bankruptcy of the shipyard which built her. Of the Orion-class consisting of the Orion, Monarch, Conqueror and Thunderer preceded by the Colossus-class and succeeded by the King George V-class. Naval Treaty of Washington between the United States, British Empire, Japan, France and Italy signed on 6 February 1922 as a result of the Washington Naval Conference between November 1921-February 1922 which intended to limit the total capitals ship tonnage of these five major powers.