Basic Details Surname Master Forenames Harold Onslow Gender Male Information stated on memorial War First World War (1914-1918) Served or died Died Primary Service As stated on memorial Service (Primary - Stated) Navy (RN) Unit (Primary - Stated) HMS Indefatigable Sub-unit (Primary - Stated) Royal Naval Reserve Rank / Title (Primary - Stated) Lieutenant Our References Service (Primary - Our reference) Royal Navy Unit (Primary - Our reference) HMS Indefatigable Rank / Title (Primary - Our reference) Lieutenant Death and Burial details Manner of death as stated Unknown