High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! HMS M31 was an M29 class monitor of the Royal Navy. The availability of ten 6 inch Mk XII guns from the Queen Elizabeth class battleships in 1915 prompted the Admiralty to order five scaled down versions of the M15 class monitors, which had been designed to utilise 9.2 inch guns. HMS M31 and her sisters were ordered from Harland

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