Basic Details Surname Costello Forenames Archibald Gordon Gender Male Information stated on memorial War First World War (1914-1918) Served or died Died Primary Service As stated on memorial Unit (Primary - Stated) County of London Regiment Rank / Title (Primary - Stated) Second Lieutenant Our References Service (Primary - Our reference) British Army Unit (Primary - Our reference) 17th Battalion London Regiment (Poplar and Stepney Rifles) Rank / Title (Primary - Our reference) Second Lieutenant Death and Burial details Country of death France Country of burial France Town of burial Longueval Cemetery Caterpillar Valley Cemetery, Longeuval Year of death 1916 Month of death September Day of death 15 Age at death 25 Manner of death as stated Killed in action Manner of death reference Killed in Action