Basic Details Surname O'Brien Forenames Leslie 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) Army (British) Unit (Primary - Stated) London Regiment Sub-unit (Primary - Stated) 13th (County Of London) Battalion Rank / Title (Primary - Stated) Lance Corporal Our References Service (Primary - Our reference) British Army Unit (Primary - Our reference) The London Regiment Rank / Title (Primary - Our reference) Lance Corporal Death and Burial details Country of burial France Cemetery Rue-david Military Year of death 1914 Month of death December Day of death 20 Age at death 19 Manner of death as stated Killed In Action Manner of death reference Killed in Action Personal Details Address 38 MILES BUILDING MARYLEBONE LODNDON Relationships SON OF HENRY M AND MARATHA O'BRIEN